{"id":8532,"date":"2023-02-26T00:51:10","date_gmt":"2023-02-25T21:21:10","guid":{"rendered":"https:\/\/nabfollower.com\/blog\/ditching-usestate-and-usereducer-why-useimmer-is-the-better-option-11hk\/"},"modified":"2023-02-26T00:51:10","modified_gmt":"2023-02-25T21:21:10","slug":"ditching-usestate-and-usereducer-why-useimmer-is-the-better-option-11hk","status":"publish","type":"post","link":"https:\/\/nabfollower.com\/blog\/ditching-usestate-and-usereducer-why-useimmer-is-the-better-option-11hk\/","title":{"rendered":"\u062d\u0630\u0641 useState \u0648 useReducer: \u0686\u0631\u0627 useImmer \u06af\u0632\u06cc\u0646\u0647 \u0628\u0647\u062a\u0631\u06cc \u0627\u0633\u062a"},"content":{"rendered":"<div data-article-id=\"1367478\" id=\"article-body\">\n<p>\u062f\u0631 React\u060c <code>useState<\/code> \u0648 <code>useReducer<\/code> \u0645\u0639\u0645\u0648\u0644\u0627 \u0628\u0631\u0627\u06cc \u0645\u062f\u06cc\u0631\u06cc\u062a \u062f\u0648\u0644\u062a \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc \u0634\u0648\u062f.  \u062f\u0631 \u062d\u0627\u0644\u06cc \u06a9\u0647 <code>useImmer<\/code> \u06cc\u06a9 \u062c\u0627\u06cc\u06af\u0632\u06cc\u0646 \u0645\u062d\u0628\u0648\u0628 \u0628\u0631\u0627\u06cc <code>useState<\/code>\u060c \u062f\u0631 \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647\u060c \u0628\u0631\u0631\u0633\u06cc \u062e\u0648\u0627\u0647\u06cc\u0645 \u06a9\u0631\u062f \u06a9\u0647 \u0686\u06af\u0648\u0646\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u06cc\u06a9 \u062c\u0627\u06cc\u06af\u0632\u06cc\u0646 \u0633\u0627\u062f\u0647 \u062a\u0631 \u0648 \u0645\u0648\u062b\u0631\u062a\u0631 \u0646\u06cc\u0632 \u0639\u0645\u0644 \u06a9\u0646\u062f <code>useReducer<\/code>.<\/p>\n<p>\u062f\u0631 \u0635\u0648\u0631\u062a\u06cc \u06a9\u0647 \u0647\u0646\u0648\u0632 \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0622\u0646 \u0622\u0634\u0646\u0627 \u0646\u06cc\u0633\u062a\u06cc\u062f <code>useImmer<\/code> \u0648 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0622\u0646 \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u062c\u0627\u06cc\u06af\u0632\u06cc\u0646\u06cc \u0628\u0631\u0627\u06cc <code>useState<\/code>\u060c \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0628\u062e\u0634 \u0632\u06cc\u0631 \u0631\u0627 \u0645\u0637\u0627\u0644\u0639\u0647 \u06a9\u0646\u06cc\u062f.  \u062f\u0631 \u063a\u06cc\u0631 \u0627\u06cc\u0646 \u0635\u0648\u0631\u062a\u060c \u0628\u0647 \u0631\u0627\u062d\u062a\u06cc \u0628\u0647 \u0628\u062e\u0634 \u0627\u0635\u0644\u06cc \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647 \u0628\u0631\u0648\u06cc\u062f.<\/p>\n<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter-rtl ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0641\u0647\u0631\u0633\u062a \u0645\u0637\u0627\u0644\u0628<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/nabfollower.com\/blog\/ditching-usestate-and-usereducer-why-useimmer-is-the-better-option-11hk\/#%D8%AF%D8%B1_%D8%B5%D9%88%D8%B1%D8%AA%DB%8C_%DA%A9%D9%87_%D8%A8%D8%A7_useImmer_%D8%A2%D8%B4%D9%86%D8%A7%DB%8C%DB%8C_%D9%86%D8%AF%D8%A7%D8%B1%DB%8C%D8%AF\" >\u062f\u0631 \u0635\u0648\u0631\u062a\u06cc \u06a9\u0647 \u0628\u0627 useImmer \u0622\u0634\u0646\u0627\u06cc\u06cc \u0646\u062f\u0627\u0631\u06cc\u062f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/nabfollower.com\/blog\/ditching-usestate-and-usereducer-why-useimmer-is-the-better-option-11hk\/#%DA%86%D8%B1%D8%A7_%D8%A8%D8%A7%DB%8C%D8%AF_%D8%A8%D9%87_%D8%AC%D8%A7%DB%8C_useReducer_%D8%A7%D8%B2_useImmer_%D8%A7%D8%B3%D8%AA%D9%81%D8%A7%D8%AF%D9%87_%DA%A9%D9%86%DB%8C%D9%85\" >\u0686\u0631\u0627 \u0628\u0627\u06cc\u062f \u0628\u0647 \u062c\u0627\u06cc useReducer \u0627\u0632 useImmer \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u0645<\/a><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"%D8%AF%D8%B1_%D8%B5%D9%88%D8%B1%D8%AA%DB%8C_%DA%A9%D9%87_%D8%A8%D8%A7_useImmer_%D8%A2%D8%B4%D9%86%D8%A7%DB%8C%DB%8C_%D9%86%D8%AF%D8%A7%D8%B1%DB%8C%D8%AF\"><\/span>\n<p>  \u062f\u0631 \u0635\u0648\u0631\u062a\u06cc \u06a9\u0647 \u0628\u0627 useImmer \u0622\u0634\u0646\u0627\u06cc\u06cc \u0646\u062f\u0627\u0631\u06cc\u062f<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/p>\n<p><code>useImmer<\/code>  \u06cc\u06a9 \u0642\u0644\u0627\u0628 \u0633\u0641\u0627\u0631\u0634\u06cc React \u0627\u0633\u062a.  \u0634\u0628\u06cc\u0647 \u0628\u0647 <code>useState<\/code> \u0627\u0645\u0627 \u0628\u0631\u062e\u06cc \u0627\u0632 \u0645\u0632\u0627\u06cc\u0627\u06cc \u0645\u062a\u0645\u0627\u06cc\u0632 \u0631\u0627 \u0627\u0631\u0627\u0626\u0647 \u0645\u06cc \u062f\u0647\u062f\u060c \u0628\u0647 \u062e\u0635\u0648\u0635 \u0648\u0642\u062a\u06cc \u0635\u062d\u0628\u062a \u0627\u0632 \u0645\u062f\u06cc\u0631\u06cc\u062a \u0648\u0636\u0639\u06cc\u062a \u067e\u06cc\u0686\u06cc\u062f\u0647 \u0645\u06cc \u0634\u0648\u062f.  \u0628\u0627 <code>useImmer<\/code>\u060c \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0648\u0636\u0639\u06cc\u062a \u0631\u0627 \u0637\u0648\u0631\u06cc \u0628\u0647 \u0631\u0648\u0632 \u06a9\u0646\u06cc\u062f \u06a9\u0647 \u06af\u0648\u06cc\u06cc \u0645\u0633\u062a\u0642\u06cc\u0645\u0627\u064b \u0642\u0627\u0628\u0644 \u062a\u063a\u06cc\u06cc\u0631 \u0627\u0633\u062a\u060c \u0634\u0628\u06cc\u0647 \u0628\u0647 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0645\u0639\u0645\u0648\u0644\u06cc.  \u0627\u06cc\u0646 \u0627\u0645\u06a9\u0627\u0646 \u067e\u0630\u06cc\u0631 \u0627\u0633\u062a \u0632\u06cc\u0631\u0627 \u062f\u0631 \u067e\u0634\u062a \u0635\u062d\u0646\u0647 <code>useImmer<\/code> \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc \u06a9\u0646\u062f <code>Immer<\/code> \u06a9\u062a\u0627\u0628\u062e\u0627\u0646\u0647 \u0628\u0631\u0627\u06cc \u0627\u06cc\u062c\u0627\u062f \u06cc\u06a9 \u0646\u0633\u062e\u0647 \u062a\u063a\u06cc\u06cc\u0631\u0646\u0627\u067e\u0630\u06cc\u0631 \u062c\u062f\u06cc\u062f \u0627\u0632 \u062d\u0627\u0644\u062a.<\/p>\n<\/p>\n<p>\u0628\u0631\u0627\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 <code>useImmer<\/code>\u0627\u0628\u062a\u062f\u0627 \u0628\u0627\u06cc\u062f \u0628\u0627 \u0627\u062c\u0631\u0627\u06cc \u062f\u0633\u062a\u0648\u0631 \u0632\u06cc\u0631 \u062f\u0631 \u062a\u0631\u0645\u06cc\u0646\u0627\u0644 \u062e\u0648\u062f \u0622\u0646 \u0631\u0627 \u0646\u0635\u0628 \u06a9\u0646\u06cc\u062f:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight shell\"><code>npm <span class=\"nb\">install <\/span>immer use-immer\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u06cc\u06a9 \u0645\u062b\u0627\u0644 \u0633\u0627\u062f\u0647 \u0627\u0632 <code>useImmer<\/code>:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code><span class=\"cm\">\/* importing useImmer *\/<\/span>\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useImmer<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">use-immer<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\n\n<span class=\"cm\">\/* functional component *\/<\/span>\n<span class=\"kd\">function<\/span> <span class=\"nx\">Count<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\n\n  <span class=\"cm\">\/* Declaring a new state variable using the useImmer hook.\n    Here, we are initializing our state with a single\n    property called \"count\" with an initial value of 0 *\/<\/span>\n\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">state<\/span><span class=\"p\">,<\/span> <span class=\"nx\">updateState<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useImmer<\/span><span class=\"p\">({<\/span> <span class=\"na\">count<\/span><span class=\"p\">:<\/span> <span class=\"mi\">0<\/span> <span class=\"p\">});<\/span>\n\n\n  <span class=\"cm\">\/* Defining a function that will modify our state *\/<\/span>\n  <span class=\"kd\">const<\/span> <span class=\"nx\">increment<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n    <span class=\"cm\">\/* calling the updateState function and passing as\n       it a draft *\/<\/span>\n    <span class=\"nx\">updateState<\/span><span class=\"p\">(<\/span><span class=\"nx\">draft<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n      <span class=\"cm\">\/* Here we are directly modifying the draft as \n        if it were mutable *\/<\/span>\n      <span class=\"nx\">draft<\/span><span class=\"p\">.<\/span><span class=\"nx\">count<\/span> <span class=\"o\">+=<\/span> <span class=\"mi\">1<\/span><span class=\"p\">;<\/span>\n    <span class=\"p\">})<\/span>\n  <span class=\"p\">}<\/span>\n\n\n  <span class=\"cm\">\/* Defining another function that will modify our state *\/<\/span>\n  <span class=\"kd\">const<\/span> <span class=\"nx\">decrement<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n    <span class=\"cm\">\/* Calling the updateState function and pass it a draft *\/<\/span>\n    <span class=\"nx\">updateState<\/span><span class=\"p\">(<\/span><span class=\"nx\">draft<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n      <span class=\"cm\">\/*Here we are directly modifying the draft as \n        if it were mutable *\/<\/span>\n      <span class=\"nx\">draft<\/span><span class=\"p\">.<\/span><span class=\"nx\">count<\/span> <span class=\"o\">-=<\/span> <span class=\"mi\">1<\/span><span class=\"p\">;<\/span>\n    <span class=\"p\">})<\/span>\n  <span class=\"p\">}<\/span>\n\n\n  <span class=\"cm\">\/* Rendering the UI using the state *\/<\/span>\n  <span class=\"k\">return<\/span> <span class=\"p\">(<\/span>\n    <span class=\"o\">&lt;<\/span><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span>\n      <span class=\"o\">&lt;<\/span><span class=\"nx\">h3<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">Count<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span><span class=\"nx\">state<\/span><span class=\"p\">.<\/span><span class=\"nx\">count<\/span><span class=\"p\">}<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/h1<\/span><span class=\"err\">&gt;\n<\/span>      <span class=\"o\">&lt;<\/span><span class=\"nx\">button<\/span> <span class=\"nx\">onClick<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">increment<\/span><span class=\"p\">}<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">Increment<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\n<\/span>      <span class=\"o\">&lt;<\/span><span class=\"nx\">button<\/span> <span class=\"nx\">onClick<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">decrement<\/span><span class=\"p\">}<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">Decrement<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\n<\/span>    <span class=\"o\">&lt;<\/span><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\n<\/span>  <span class=\"p\">)<\/span>\n<span class=\"p\">}<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"%DA%86%D8%B1%D8%A7_%D8%A8%D8%A7%DB%8C%D8%AF_%D8%A8%D9%87_%D8%AC%D8%A7%DB%8C_useReducer_%D8%A7%D8%B2_useImmer_%D8%A7%D8%B3%D8%AA%D9%81%D8%A7%D8%AF%D9%87_%DA%A9%D9%86%DB%8C%D9%85\"><\/span>\n<p>  \u0686\u0631\u0627 \u0628\u0627\u06cc\u062f \u0628\u0647 \u062c\u0627\u06cc useReducer \u0627\u0632 useImmer \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u0645<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<\/p>\n<p>\u0646\u0645\u0648\u0646\u0647 \u0627\u06cc \u0627\u0632 \u0622\u0646 \u0631\u0627 \u0628\u0631\u0631\u0633\u06cc \u062e\u0648\u0627\u0647\u06cc\u0645 \u06a9\u0631\u062f <code>useImmer<\/code> \u06a9\u0647 \u0628\u0647 \u062f\u0646\u0628\u0627\u0644 \u0622\u0646 \u0627\u0633\u062a <code>useReducer<\/code> \u0627\u0644\u06af\u0648.  \u0645\u0627 \u062d\u0627\u0644\u062a \u0648 \u0627\u0642\u062f\u0627\u0645\u0627\u062a \u0631\u0627 \u0627\u06cc\u062c\u0627\u062f \u062e\u0648\u0627\u0647\u06cc\u0645 \u06a9\u0631\u062f \u0648 \u0627\u0632 \u0622\u0646\u0647\u0627 \u0628\u0647 \u0631\u0648\u0634\u06cc \u0645\u0634\u0627\u0628\u0647 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u062e\u0648\u0627\u0647\u06cc\u0645 \u06a9\u0631\u062f <code>useReducer<\/code>\u060c \u0627\u0645\u0627 \u0628\u0627 \u0627\u0641\u0632\u0627\u06cc\u0634 \u062e\u0648\u0627\u0646\u0627\u06cc\u06cc\u060c \u0627\u0646\u0639\u0637\u0627\u0641 \u067e\u0630\u06cc\u0631\u06cc \u0648 \u062a\u063a\u06cc\u06cc\u0631\u067e\u0630\u06cc\u0631\u06cc useImmer.  \u0627\u0632 \u0637\u0631\u06cc\u0642 \u0627\u06cc\u0646 \u0645\u062b\u0627\u0644\u060c \u062e\u0648\u0627\u0647\u06cc\u0645 \u062f\u06cc\u062f \u06a9\u0647 \u0686\u0631\u0627 <code>useImmer<\/code> \u0628\u0627\u06cc\u062f \u0628\u06cc\u0634\u062a\u0631 \u0627\u0632 <code>useReducer<\/code>.<\/p>\n<\/p>\n<p><strong>useImmer \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f \u0648 \u06a9\u0627\u0645\u067e\u0648\u0646\u0646\u062a \u0639\u0645\u0644\u06a9\u0631\u062f\u06cc \u0631\u0627 \u0627\u06cc\u062c\u0627\u062f \u06a9\u0646\u06cc\u062f<\/strong><\/p>\n<p><\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code><span class=\"c1\">\/\/ import useImmer<\/span>\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useImmer<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">use-immer<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\n\n<span class=\"c1\">\/\/ functional component<\/span>\n<span class=\"kd\">function<\/span> <span class=\"nx\">Cart<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\n\n  <span class=\"c1\">\/\/ ... <\/span>\n\n<span class=\"p\">}<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p><strong>\u062d\u0627\u0644\u062a \u0627\u0648\u0644\u06cc\u0647 \u0631\u0627 \u062a\u0639\u0631\u06cc\u0641 \u06a9\u0646\u06cc\u062f<\/strong><\/p>\n<\/p>\n<p>\u0647\u0646\u06af\u0627\u0645 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 <code>useReducer<\/code>\u060c \u062a\u0639\u0631\u06cc\u0641 \u062d\u0627\u0644\u062a \u0627\u0648\u0644\u06cc\u0647 \u0642\u0628\u0644 \u0627\u0632 \u0627\u062f\u0627\u0645\u0647 \u06a9\u0627\u0631 \u0645\u0639\u0645\u0648\u0644 \u0627\u0633\u062a.  \u0628\u0647 \u0637\u0648\u0631 \u0645\u0634\u0627\u0628\u0647\u060c \u0645\u0627 \u0627\u0632 \u0627\u06cc\u0646 \u0631\u0648\u06cc\u06a9\u0631\u062f \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 <code>useImmer<\/code> \u0642\u0644\u0627\u0628.  \u0628\u0631\u0627\u06cc \u0627\u0646\u062c\u0627\u0645 \u0627\u06cc\u0646 \u06a9\u0627\u0631\u060c \u062d\u0627\u0644\u062a\u06cc \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc \u06a9\u0646\u06cc\u0645 \u06a9\u0647 \u062a\u0627 \u062d\u062f\u0648\u062f\u06cc \u067e\u06cc\u0686\u06cc\u062f\u0647 \u0627\u0633\u062a \u0648 \u0634\u0628\u06cc\u0647 \u062d\u0627\u0644\u062a\u06cc \u0627\u0633\u062a \u06a9\u0647 \u0645\u0639\u0645\u0648\u0644\u0627\u064b \u0628\u0627 \u0622\u0646 \u062a\u0639\u0631\u06cc\u0641 \u0645\u06cc \u06a9\u0646\u06cc\u062f. <code>useReducer<\/code>.<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code><span class=\"c1\">\/\/ initial state<\/span>\n<span class=\"kd\">const<\/span> <span class=\"nx\">initialState<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\n    <span class=\"na\">items<\/span><span class=\"p\">:<\/span> <span class=\"p\">[],<\/span>\n    <span class=\"na\">shippingAddress<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n        <span class=\"na\">street<\/span><span class=\"p\">:<\/span> <span class=\"dl\">''<\/span><span class=\"p\">,<\/span>\n        <span class=\"na\">city<\/span><span class=\"p\">:<\/span> <span class=\"dl\">''<\/span>\n    <span class=\"p\">}<\/span>\n<span class=\"p\">}<\/span>  \n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p><strong>\u062f\u0648\u0644\u062a \u0631\u0627 \u0627\u06cc\u062c\u0627\u062f \u06a9\u0646\u06cc\u062f<\/strong><\/p>\n<\/p>\n<p>\u0645\u0627 \u062d\u0627\u0644\u062a \u0627\u0648\u0644\u06cc\u0647 \u062e\u0648\u062f \u0631\u0627 \u062a\u0639\u0631\u06cc\u0641 \u06a9\u0631\u062f\u0647 \u0627\u06cc\u0645.  \u0627\u06a9\u0646\u0648\u0646\u060c \u0645\u0627 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u0645 \u062d\u0627\u0644\u062a \u062e\u0648\u062f \u0631\u0627 \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 <code>useImmer<\/code> \u0642\u0644\u0627\u0628.<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code><span class=\"c1\">\/\/ Creating the state<\/span>\n<span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">cart<\/span><span class=\"p\">,<\/span> <span class=\"nx\">updateCart<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useImmer<\/span><span class=\"p\">(<\/span><span class=\"nx\">initialState<\/span><span class=\"p\">)<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0631\u0627 <code>useImmer<\/code> \u0647\u0648\u06a9 \u0622\u0631\u0627\u06cc\u0647 \u0627\u06cc \u062d\u0627\u0648\u06cc \u062f\u0648 \u0645\u0642\u062f\u0627\u0631 \u0631\u0627 \u0628\u0631\u0645\u06cc \u06af\u0631\u062f\u0627\u0646\u062f: \u0648\u0636\u0639\u06cc\u062a \u0641\u0639\u0644\u06cc (<code>cart<\/code> \u062f\u0631 \u0627\u06cc\u0646 \u0645\u062b\u0627\u0644) \u0648 \u062a\u0627\u0628\u0639\u06cc \u06a9\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u0645 \u0628\u0631\u0627\u06cc \u0628\u0647 \u0631\u0648\u0632 \u0631\u0633\u0627\u0646\u06cc \u062d\u0627\u0644\u062a (<code>updateCart<\/code> \u062f\u0631 \u0627\u06cc\u0646 \u0645\u062b\u0627\u0644).<\/p>\n<\/p>\n<p><strong>Actions \u0631\u0627 \u0627\u06cc\u062c\u0627\u062f \u06a9\u0646\u06cc\u062f<\/strong><\/p>\n<\/p>\n<p>\u0647\u0646\u06af\u0627\u0645 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 <code>useReducer<\/code> \u0642\u0644\u0627\u0628\u060c \u0628\u0631\u0627\u06cc \u0628\u0647 \u0631\u0648\u0632 \u0631\u0633\u0627\u0646\u06cc \u062d\u0627\u0644\u062a\u060c \u062a\u0639\u0631\u06cc\u0641 \u0627\u0642\u062f\u0627\u0645\u0627\u062a \u0627\u062c\u0628\u0627\u0631\u06cc \u0627\u0633\u062a.  \u0628\u0647 \u0637\u0648\u0631 \u0645\u0634\u0627\u0628\u0647\u060c \u0645\u0627 \u0627\u0642\u062f\u0627\u0645\u0627\u062a\u06cc \u0631\u0627 \u0628\u0631\u0627\u06cc \u0627\u06cc\u062c\u0627\u062f \u062e\u0648\u0627\u0647\u06cc\u0645 \u06a9\u0631\u062f <code>useImmer<\/code> \u0628\u0631\u0627\u06cc \u0634\u0628\u06cc\u0647 \u0633\u0627\u0632\u06cc \u0647\u0645\u0627\u0646 \u0627\u0644\u06af\u0648 \u0648 \u062f\u0633\u062a\u06cc\u0627\u0628\u06cc \u0628\u0647 \u0628\u0647 \u0631\u0648\u0632 \u0631\u0633\u0627\u0646\u06cc \u062d\u0627\u0644\u062a \u0642\u0627\u0628\u0644 \u067e\u06cc\u0634 \u0628\u06cc\u0646\u06cc.<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">actions<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\n\n    <span class=\"c1\">\/\/ Add an item to the cart<\/span>\n    <span class=\"na\">addItemToCart<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"nx\">payload<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n\n        <span class=\"kd\">const<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">item<\/span> <span class=\"p\">}<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">payload<\/span>\n\n        <span class=\"nx\">updateCart<\/span><span class=\"p\">(<\/span><span class=\"nx\">draft<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n            <span class=\"nx\">draft<\/span><span class=\"p\">.<\/span><span class=\"nx\">items<\/span><span class=\"p\">.<\/span><span class=\"nx\">push<\/span><span class=\"p\">(<\/span><span class=\"nx\">item<\/span><span class=\"p\">)<\/span>\n        <span class=\"p\">});<\/span>\n    <span class=\"p\">},<\/span>\n\n    <span class=\"c1\">\/\/ Remove an item from the cart<\/span>\n    <span class=\"na\">removeItemFromCart<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"nx\">payload<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n\n        <span class=\"kd\">const<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">itemIndex<\/span> <span class=\"p\">}<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">payload<\/span>\n\n        <span class=\"nx\">updateCart<\/span><span class=\"p\">(<\/span><span class=\"nx\">draft<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n            <span class=\"nx\">draft<\/span><span class=\"p\">.<\/span><span class=\"nx\">items<\/span><span class=\"p\">.<\/span><span class=\"nx\">splice<\/span><span class=\"p\">(<\/span><span class=\"nx\">itemIndex<\/span><span class=\"p\">,<\/span> <span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n        <span class=\"p\">})<\/span>\n    <span class=\"p\">},<\/span>\n\n    <span class=\"c1\">\/\/ Update the shipping address of the cart<\/span>\n    <span class=\"na\">updateShippingAddress<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"nx\">payload<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n\n        <span class=\"kd\">const<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">shippingAddress<\/span> <span class=\"p\">}<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">payload<\/span>\n\n        <span class=\"nx\">updateCart<\/span><span class=\"p\">(<\/span><span class=\"nx\">draft<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n            <span class=\"nx\">draft<\/span><span class=\"p\">.<\/span><span class=\"nx\">shippingAddress<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">shippingAddress<\/span>\n        <span class=\"p\">})<\/span>\n    <span class=\"p\">}<\/span>\n<span class=\"p\">}<\/span>\n\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u062a\u0639\u0631\u06cc\u0641 \u0627\u0642\u062f\u0627\u0645\u0627\u062a \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0631\u0648\u0634 \u0641\u0648\u0642 \u062f\u0648 \u0645\u0632\u06cc\u062a \u0646\u0633\u0628\u062a \u0628\u0647 \u0622\u0646 \u062f\u0627\u0631\u062f <code>useReducer<\/code>:<\/p>\n<p>\u26a1\ufe0f \u062a\u063a\u06cc\u06cc\u0631\u067e\u0630\u06cc\u0631\u06cc: \u0628\u0627 <code>useImmer<\/code>\u060c \u0645\u0627 \u0642\u062f\u0631\u062a \u0628\u0647 \u0631\u0648\u0632 \u0631\u0633\u0627\u0646\u06cc \u0647\u0627\u06cc \u0642\u0627\u0628\u0644 \u062a\u063a\u06cc\u06cc\u0631 \u0631\u0627 \u062f\u0627\u0631\u06cc\u0645 \u06a9\u0647 \u0628\u0647 \u06a9\u062f \u06a9\u0645\u062a\u0631 \u0648 \u06a9\u062f\u0647\u0627\u06cc \u0628\u06cc\u0634\u062a\u0631 \u0634\u0628\u06cc\u0647 \u062c\u0627\u0648\u0627 \u0627\u0633\u06a9\u0631\u06cc\u067e\u062a \u0627\u062c\u0627\u0632\u0647 \u0645\u06cc \u062f\u0647\u062f.  \u0627\u06cc\u0646 \u0628\u0631 \u062e\u0644\u0627\u0641 \u0627\u0633\u062a <code>useReducer<\/code> \u06a9\u0647 \u0628\u0647 \u06cc\u06a9 \u0631\u0648\u06cc\u06a9\u0631\u062f \u0628\u0631\u0646\u0627\u0645\u0647 \u0646\u0648\u06cc\u0633\u06cc \u06a9\u0627\u0631\u0628\u0631\u062f\u06cc \u062a\u0631 \u0648 \u0628\u0647 \u0631\u0648\u0632 \u0631\u0633\u0627\u0646\u06cc \u0647\u0627\u06cc \u062a\u063a\u06cc\u06cc\u0631\u0646\u0627\u067e\u0630\u06cc\u0631 \u0646\u06cc\u0627\u0632 \u062f\u0627\u0631\u062f.  \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0628\u0647 \u0631\u0648\u0632 \u0631\u0633\u0627\u0646\u06cc \u0647\u0627\u06cc \u0642\u0627\u0628\u0644 \u062a\u063a\u06cc\u06cc\u0631 \u062f\u0631 <code>useImmer<\/code>\u060c \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u062f \u0628\u0627 \u062e\u0637\u0648\u0637 \u06a9\u0645\u062a\u0631 \u06a9\u062f \u0628\u0647 \u0647\u0645\u0627\u0646 \u0646\u062a\u06cc\u062c\u0647 \u0628\u0631\u0633\u06cc\u062f \u0648 \u0646\u0648\u0634\u062a\u0646 \u0648 \u0646\u06af\u0647\u062f\u0627\u0631\u06cc \u0622\u0646 \u0631\u0627 \u0622\u0633\u0627\u0646 \u062a\u0631 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<p>\u26a1\ufe0f \u062e\u0648\u0627\u0646\u0627\u06cc\u06cc: \u062f\u0631 \u0645\u0642\u0627\u06cc\u0633\u0647 \u0628\u0627 <code>useReducer<\/code>\u060c \u06a9\u0647 \u062f\u0631 \u0622\u0646 \u0627\u0642\u062f\u0627\u0645\u0627\u062a \u0645\u0639\u0645\u0648\u0644\u0627\u064b \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 a \u062a\u0639\u0631\u06cc\u0641 \u0645\u06cc \u0634\u0648\u0646\u062f <code>switch<\/code> \u0645\u0648\u0631\u062f \u062f\u0631 \u06cc\u06a9 \u062a\u0627\u0628\u0639 \u06a9\u0627\u0647\u0646\u062f\u0647\u060c <code>useImmer<\/code> \u0631\u0648\u06cc\u06a9\u0631\u062f \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u062e\u0648\u0627\u0646\u0627\u062a\u0631 \u0628\u0627\u0634\u062f \u0632\u06cc\u0631\u0627 \u0647\u0631 \u0639\u0645\u0644 \u06cc\u06a9 \u062a\u0627\u0628\u0639 \u062c\u062f\u0627\u06af\u0627\u0646\u0647 \u0628\u0627 \u0646\u0627\u0645\u06cc \u0648\u0627\u0636\u062d \u0648 \u0645\u062e\u062a\u0635\u0631 \u0627\u0633\u062a. <\/p>\n<\/p>\n<p><strong>UI \u0631\u0627 \u0628\u0627 JSX \u0631\u0646\u062f\u0631 \u06a9\u0646\u06cc\u062f<\/strong><\/p>\n<\/p>\n<p>\u062f\u0631 \u0646\u0647\u0627\u06cc\u062a \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u0645 \u0627\u0632 <code>cart<\/code> \u0627\u06cc\u0627\u0644\u062a \u0648 <code>actions<\/code> \u0634\u06cc \u062f\u0631 JSX \u0628\u0631\u0627\u06cc \u0631\u0646\u062f\u0631 \u06a9\u0631\u062f\u0646 \u0631\u0627\u0628\u0637 \u06a9\u0627\u0631\u0628\u0631\u06cc.<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code><span class=\"o\">&lt;<\/span><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span>\n\n    <span class=\"p\">{<\/span><span class=\"cm\">\/* Displaying the changes of the 'cart' state *\/<\/span><span class=\"p\">}<\/span>\n    <span class=\"o\">&lt;<\/span><span class=\"nx\">p<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">Cart<\/span> <span class=\"nx\">State<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span><span class=\"nx\">JSON<\/span><span class=\"p\">.<\/span><span class=\"nx\">stringify<\/span><span class=\"p\">(<\/span><span class=\"nx\">cart<\/span><span class=\"p\">)}<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/p<\/span><span class=\"err\">&gt;\n<\/span>\n    <span class=\"p\">{<\/span><span class=\"cm\">\/* Display a list of items in the cart *\/<\/span><span class=\"p\">}<\/span>\n    <span class=\"o\">&lt;<\/span><span class=\"nx\">ul<\/span><span class=\"o\">&gt;<\/span>\n        <span class=\"p\">{<\/span><span class=\"nx\">cart<\/span><span class=\"p\">.<\/span><span class=\"nx\">items<\/span><span class=\"p\">.<\/span><span class=\"nx\">map<\/span><span class=\"p\">((<\/span><span class=\"nx\">item<\/span><span class=\"p\">,<\/span> <span class=\"nx\">index<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">(<\/span>\n            <span class=\"o\">&lt;<\/span><span class=\"nx\">li<\/span> <span class=\"nx\">key<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">index<\/span><span class=\"p\">}<\/span><span class=\"o\">&gt;<\/span>\n                <span class=\"p\">{<\/span><span class=\"nx\">item<\/span><span class=\"p\">.<\/span><span class=\"nx\">name<\/span><span class=\"p\">}<\/span> <span class=\"o\">-<\/span> <span class=\"nx\">$<\/span><span class=\"p\">{<\/span><span class=\"nx\">item<\/span><span class=\"p\">.<\/span><span class=\"nx\">price<\/span><span class=\"p\">}<\/span>\n\n                <span class=\"p\">{<\/span><span class=\"cm\">\/* Call the removeItemFromCart action when the remove button is clicked *\/<\/span><span class=\"p\">}<\/span>\n                <span class=\"o\">&lt;<\/span><span class=\"nx\">button<\/span> <span class=\"nx\">onClick<\/span><span class=\"o\">=<\/span><span class=\"p\">{()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">actions<\/span><span class=\"p\">.<\/span><span class=\"nx\">removeItemFromCart<\/span><span class=\"p\">({<\/span> <span class=\"na\">itemIndex<\/span><span class=\"p\">:<\/span> <span class=\"nx\">index<\/span> <span class=\"p\">})}<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">Remove<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\n<\/span>            <span class=\"o\">&lt;<\/span><span class=\"sr\">\/li<\/span><span class=\"err\">&gt;\n<\/span>        <span class=\"p\">))}<\/span>\n    <span class=\"o\">&lt;<\/span><span class=\"sr\">\/ul<\/span><span class=\"err\">&gt;\n<\/span>\n    <span class=\"p\">{<\/span><span class=\"cm\">\/* Call the addItemToCart action when the add item button is clicked *\/<\/span><span class=\"p\">}<\/span>\n    <span class=\"o\">&lt;<\/span><span class=\"nx\">button<\/span> <span class=\"nx\">onClick<\/span><span class=\"o\">=<\/span><span class=\"p\">{()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">actions<\/span><span class=\"p\">.<\/span><span class=\"nx\">addItemToCart<\/span><span class=\"p\">({<\/span> <span class=\"na\">item<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">Product<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"na\">price<\/span><span class=\"p\">:<\/span> <span class=\"mf\">9.99<\/span> <span class=\"p\">}<\/span> <span class=\"p\">})}<\/span><span class=\"o\">&gt;<\/span>\n        <span class=\"nx\">Add<\/span> <span class=\"nx\">Item<\/span>\n    <span class=\"o\">&lt;<\/span><span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\n<\/span>\n\n    <span class=\"p\">{<\/span><span class=\"cm\">\/* Allow the user to update the shipping address *\/<\/span><span class=\"p\">}<\/span>\n    <span class=\"o\">&lt;<\/span><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span>\n\n        <span class=\"o\">&lt;<\/span><span class=\"nx\">h4<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">Shipping<\/span> <span class=\"nx\">Address<\/span><span class=\"p\">:<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/h4<\/span><span class=\"err\">&gt;\n<\/span>\n        <span class=\"o\">&lt;<\/span><span class=\"nx\">input<\/span> <span class=\"nx\">type<\/span><span class=\"o\">=<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">text<\/span><span class=\"dl\">\"<\/span> <span class=\"nx\">placeholder<\/span><span class=\"o\">=<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">Street<\/span><span class=\"dl\">\"<\/span>\n            <span class=\"nx\">value<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">cart<\/span><span class=\"p\">.<\/span><span class=\"nx\">shippingAddress<\/span><span class=\"p\">.<\/span><span class=\"nx\">street<\/span><span class=\"p\">}<\/span>\n            <span class=\"nx\">onChange<\/span><span class=\"o\">=<\/span><span class=\"p\">{(<\/span><span class=\"nx\">e<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">actions<\/span><span class=\"p\">.<\/span><span class=\"nx\">updateShippingAddress<\/span><span class=\"p\">({<\/span> <span class=\"na\">shippingAddress<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"p\">...<\/span><span class=\"nx\">cart<\/span><span class=\"p\">.<\/span><span class=\"nx\">shippingAddress<\/span><span class=\"p\">,<\/span> <span class=\"na\">street<\/span><span class=\"p\">:<\/span> <span class=\"nx\">e<\/span><span class=\"p\">.<\/span><span class=\"nx\">target<\/span><span class=\"p\">.<\/span><span class=\"nx\">value<\/span> <span class=\"p\">}<\/span> <span class=\"p\">})}<\/span>\n        <span class=\"sr\">\/<\/span><span class=\"err\">&gt;\n<\/span>\n        <span class=\"o\">&lt;<\/span><span class=\"nx\">input<\/span> <span class=\"nx\">type<\/span><span class=\"o\">=<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">text<\/span><span class=\"dl\">\"<\/span> <span class=\"nx\">placeholder<\/span><span class=\"o\">=<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">City<\/span><span class=\"dl\">\"<\/span>\n            <span class=\"nx\">value<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">cart<\/span><span class=\"p\">.<\/span><span class=\"nx\">shippingAddress<\/span><span class=\"p\">.<\/span><span class=\"nx\">city<\/span><span class=\"p\">}<\/span>\n            <span class=\"nx\">onChange<\/span><span class=\"o\">=<\/span><span class=\"p\">{(<\/span><span class=\"nx\">e<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">actions<\/span><span class=\"p\">.<\/span><span class=\"nx\">updateShippingAddress<\/span><span class=\"p\">({<\/span> <span class=\"na\">shippingAddress<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"p\">...<\/span><span class=\"nx\">cart<\/span><span class=\"p\">.<\/span><span class=\"nx\">shippingAddress<\/span><span class=\"p\">,<\/span> <span class=\"na\">city<\/span><span class=\"p\">:<\/span> <span class=\"nx\">e<\/span><span class=\"p\">.<\/span><span class=\"nx\">target<\/span><span class=\"p\">.<\/span><span class=\"nx\">value<\/span> <span class=\"p\">}<\/span> <span class=\"p\">})}<\/span>\n        <span class=\"sr\">\/<\/span><span class=\"err\">&gt;\n<\/span>\n    <span class=\"o\">&lt;<\/span><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\n<\/span>\n\n<span class=\"o\">&lt;<\/span><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\n<\/span><\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p><strong>\u0645\u0632\u0627\u06cc\u0627\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 useImmer \u0646\u0633\u0628\u062a \u0628\u0647 useReducer<\/strong><\/p>\n<\/p>\n<p>\u0645\u0627 \u0642\u0628\u0644\u0627\u064b \u062f\u0648 \u0645\u0632\u06cc\u062a (\u062a\u063a\u06cc\u06cc\u0631\u067e\u0630\u06cc\u0631\u06cc \u0648 \u062e\u0648\u0627\u0646\u0627\u06cc\u06cc) \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 useImmer \u0646\u0633\u0628\u062a \u0628\u0647 useReducer \u0631\u0627 \u0628\u0631\u0631\u0633\u06cc \u06a9\u0631\u062f\u0647 \u0627\u06cc\u0645. <code>Create Actions<\/code> \u0628\u062e\u0634.  \u0628\u0627 \u0627\u06cc\u0646 \u062d\u0627\u0644\u060c \u06cc\u06a9 \u0645\u0632\u06cc\u062a \u0645\u0647\u0645 \u062f\u06cc\u06af\u0631 \u0648\u062c\u0648\u062f \u062f\u0627\u0631\u062f \u06a9\u0647 \u0627\u0631\u0632\u0634 \u0628\u062d\u062b \u0631\u0627 \u062f\u0627\u0631\u062f \u06a9\u0647 \u062f\u0631 \u0627\u06cc\u0646 \u0628\u062e\u0634 \u0628\u0647 \u0622\u0646 \u062e\u0648\u0627\u0647\u06cc\u0645 \u067e\u0631\u062f\u0627\u062e\u062a.<\/p>\n<\/p>\n<p>\u26a1\ufe0f \u0627\u0646\u0639\u0637\u0627\u0641 \u067e\u0630\u06cc\u0631\u06cc: \u0628\u0627 useImmer\u060c \u0627\u0645\u06a9\u0627\u0646 \u0628\u0647 \u0631\u0648\u0632 \u0631\u0633\u0627\u0646\u06cc \u0634\u06cc \u062d\u0627\u0644\u062a \u062e\u0627\u0631\u062c \u0627\u0632 \u0627\u06a9\u0634\u0646 \u0647\u0627\u06cc \u062a\u0639\u0631\u06cc\u0641 \u0634\u062f\u0647 \u0648\u062c\u0648\u062f \u062f\u0627\u0631\u062f.  \u0627\u06cc\u0646 \u062f\u0631 useReducer \u0627\u0645\u06a9\u0627\u0646 \u067e\u0630\u06cc\u0631 \u0646\u06cc\u0633\u062a \u0648 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0628\u0647 \u0648\u06cc\u0698\u0647 \u062f\u0631 \u0634\u0631\u0627\u06cc\u0637 \u062e\u0627\u0635\u06cc \u06a9\u0647 \u0628\u0647 \u0627\u0646\u0639\u0637\u0627\u0641 \u067e\u0630\u06cc\u0631\u06cc \u0628\u06cc\u0634\u062a\u0631\u06cc \u062f\u0631 \u0628\u0647 \u0631\u0648\u0632 \u0631\u0633\u0627\u0646\u06cc \u062d\u0627\u0644\u062a \u0646\u06cc\u0627\u0632 \u062f\u0627\u0631\u06cc\u062f \u0645\u0641\u06cc\u062f \u0628\u0627\u0634\u062f.<\/p>\n<p>\u062f\u0631 \u0627\u06cc\u0646\u062c\u0627 \u0645\u062b\u0627\u0644\u06cc \u0627\u0632 \u0646\u062d\u0648\u0647 \u067e\u0627\u06a9 \u06a9\u0631\u062f\u0646 \u0633\u0628\u062f \u062e\u0631\u06cc\u062f \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0622\u0646 \u0622\u0648\u0631\u062f\u0647 \u0634\u062f\u0647 \u0627\u0633\u062a <code>useImmer<\/code> \u0628\u062f\u0648\u0646 \u062a\u0639\u0631\u06cc\u0641 \u0639\u0645\u0644 \u062c\u062f\u06cc\u062f:<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code><span class=\"o\">&lt;<\/span><span class=\"nx\">button<\/span> <span class=\"nx\">onClick<\/span><span class=\"o\">=<\/span><span class=\"p\">{()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">updateCart<\/span><span class=\"p\">(<\/span><span class=\"nx\">initialState<\/span><span class=\"p\">)}<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">Clear<\/span> <span class=\"nx\">Cart<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\n<\/span><\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u0627\u06cc\u0646 \u0645\u0648\u0644\u0641\u0647 \u062f\u06a9\u0645\u0647 \u0631\u0627 \u0628\u0627\u0632\u0646\u0634\u0627\u0646\u06cc \u0645\u06cc \u06a9\u0646\u062f <code>cart<\/code> \u0648\u0636\u0639\u06cc\u062a \u0631\u0627 \u0628\u0647 \u062d\u0627\u0644\u062a \u0627\u0648\u0644\u06cc\u0647 \u062e\u0648\u062f \u0628\u0627\u0632\u06af\u0631\u062f\u0627\u0646\u06cc\u062f \u0648 \u062a\u0645\u0627\u0645 \u0645\u0648\u0627\u0631\u062f \u0645\u0648\u062c\u0648\u062f \u062f\u0631 \u0633\u0628\u062f \u062e\u0631\u06cc\u062f \u0631\u0627 \u067e\u0627\u06a9 \u06a9\u0646\u06cc\u062f.  \u0628\u0627 <code>useImmer<\/code>\u060c \u0645\u06cc\u200c\u062a\u0648\u0627\u0646\u06cc\u0645 \u0634\u06cc state \u0631\u0627 \u0645\u0633\u062a\u0642\u06cc\u0645\u0627\u064b \u0628\u0647 \u0627\u06cc\u0646 \u0631\u0648\u0634 ad-hoc \u0628\u062f\u0648\u0646 \u0646\u06cc\u0627\u0632 \u0628\u0647 \u062a\u0639\u0631\u06cc\u0641 \u0639\u0645\u0644 \u0628\u0647\u200c\u0631\u0648\u0632\u0631\u0633\u0627\u0646\u06cc \u06a9\u0646\u06cc\u0645.  \u0627\u06cc\u0646 \u0627\u0645\u06a9\u0627\u0646 \u067e\u0630\u06cc\u0631 \u0646\u06cc\u0633\u062a \u0628\u0627 <code>useReducer<\/code>\u060c \u06a9\u0647 \u062f\u0631 \u0622\u0646 \u062a\u0645\u0627\u0645 \u0628\u0647 \u0631\u0648\u0632 \u0631\u0633\u0627\u0646\u06cc \u0647\u0627\u06cc \u062d\u0627\u0644\u062a \u0628\u0627\u06cc\u062f \u0627\u0632 \u0637\u0631\u06cc\u0642 \u0627\u0642\u062f\u0627\u0645\u0627\u062a \u062a\u0639\u0631\u06cc\u0641 \u0634\u062f\u0647 \u0627\u0631\u0633\u0627\u0644 \u0634\u0648\u0646\u062f.<\/p>\n<\/p>\n<p><strong>\u06a9\u062f \u06a9\u0627\u0645\u0644<\/strong><\/p>\n<p><\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code><span class=\"c1\">\/\/ import useImmer<\/span>\n<span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useImmer<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">use-immer<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\n\n\n<span class=\"c1\">\/\/ functional component<\/span>\n<span class=\"k\">export<\/span> <span class=\"k\">default<\/span> <span class=\"kd\">function<\/span> <span class=\"nx\">Cart<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\n\n    <span class=\"c1\">\/\/ Define the initial state of the cart<\/span>\n    <span class=\"kd\">const<\/span> <span class=\"nx\">initialState<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\n        <span class=\"na\">items<\/span><span class=\"p\">:<\/span> <span class=\"p\">[],<\/span>\n        <span class=\"na\">shippingAddress<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\n            <span class=\"na\">street<\/span><span class=\"p\">:<\/span> <span class=\"dl\">''<\/span><span class=\"p\">,<\/span>\n            <span class=\"na\">city<\/span><span class=\"p\">:<\/span> <span class=\"dl\">''<\/span>\n        <span class=\"p\">}<\/span>\n    <span class=\"p\">};<\/span>\n\n    <span class=\"c1\">\/\/ Call the useImmer hook to create a cart state <\/span>\n    <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">cart<\/span><span class=\"p\">,<\/span> <span class=\"nx\">updateCart<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">useImmer<\/span><span class=\"p\">(<\/span><span class=\"nx\">initialState<\/span><span class=\"p\">);<\/span>\n\n    <span class=\"c1\">\/\/ Define a set of actions that can be used to update the cart state<\/span>\n    <span class=\"kd\">const<\/span> <span class=\"nx\">actions<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\n\n        <span class=\"c1\">\/\/ Add an item to the cart<\/span>\n        <span class=\"na\">addItemToCart<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"nx\">payload<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n\n            <span class=\"kd\">const<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">item<\/span> <span class=\"p\">}<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">payload<\/span>\n\n            <span class=\"nx\">updateCart<\/span><span class=\"p\">(<\/span><span class=\"nx\">draft<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n                <span class=\"nx\">draft<\/span><span class=\"p\">.<\/span><span class=\"nx\">items<\/span><span class=\"p\">.<\/span><span class=\"nx\">push<\/span><span class=\"p\">(<\/span><span class=\"nx\">item<\/span><span class=\"p\">)<\/span>\n            <span class=\"p\">});<\/span>\n        <span class=\"p\">},<\/span>\n\n        <span class=\"c1\">\/\/ Remove an item from the cart<\/span>\n        <span class=\"na\">removeItemFromCart<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"nx\">payload<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n\n            <span class=\"kd\">const<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">itemIndex<\/span> <span class=\"p\">}<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">payload<\/span>\n\n            <span class=\"nx\">updateCart<\/span><span class=\"p\">(<\/span><span class=\"nx\">draft<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n                <span class=\"nx\">draft<\/span><span class=\"p\">.<\/span><span class=\"nx\">items<\/span><span class=\"p\">.<\/span><span class=\"nx\">splice<\/span><span class=\"p\">(<\/span><span class=\"nx\">itemIndex<\/span><span class=\"p\">,<\/span> <span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\n            <span class=\"p\">})<\/span>\n        <span class=\"p\">},<\/span>\n\n        <span class=\"c1\">\/\/ Update the shipping address of the cart<\/span>\n        <span class=\"na\">updateShippingAddress<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"nx\">payload<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n\n            <span class=\"kd\">const<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">shippingAddress<\/span> <span class=\"p\">}<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">payload<\/span>\n\n            <span class=\"nx\">updateCart<\/span><span class=\"p\">(<\/span><span class=\"nx\">draft<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n                <span class=\"nx\">draft<\/span><span class=\"p\">.<\/span><span class=\"nx\">shippingAddress<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">shippingAddress<\/span>\n            <span class=\"p\">})<\/span>\n        <span class=\"p\">}<\/span>\n    <span class=\"p\">}<\/span>\n\n\n    <span class=\"c1\">\/\/ Render the cart UI<\/span>\n    <span class=\"k\">return<\/span> <span class=\"p\">(<\/span>\n\n        <span class=\"o\">&lt;<\/span><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span>\n\n            <span class=\"p\">{<\/span><span class=\"cm\">\/* Displaying the changes of the 'cart' state *\/<\/span><span class=\"p\">}<\/span>\n            <span class=\"o\">&lt;<\/span><span class=\"nx\">p<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">Cart<\/span> <span class=\"nx\">State<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span><span class=\"nx\">JSON<\/span><span class=\"p\">.<\/span><span class=\"nx\">stringify<\/span><span class=\"p\">(<\/span><span class=\"nx\">cart<\/span><span class=\"p\">)}<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/p<\/span><span class=\"err\">&gt;\n<\/span>\n            <span class=\"p\">{<\/span><span class=\"cm\">\/* Display a list of items in the cart *\/<\/span><span class=\"p\">}<\/span>\n            <span class=\"o\">&lt;<\/span><span class=\"nx\">ul<\/span><span class=\"o\">&gt;<\/span>\n                <span class=\"p\">{<\/span><span class=\"nx\">cart<\/span><span class=\"p\">.<\/span><span class=\"nx\">items<\/span><span class=\"p\">.<\/span><span class=\"nx\">map<\/span><span class=\"p\">((<\/span><span class=\"nx\">item<\/span><span class=\"p\">,<\/span> <span class=\"nx\">index<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">(<\/span>\n                    <span class=\"o\">&lt;<\/span><span class=\"nx\">li<\/span> <span class=\"nx\">key<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">index<\/span><span class=\"p\">}<\/span><span class=\"o\">&gt;<\/span>\n                        <span class=\"p\">{<\/span><span class=\"nx\">item<\/span><span class=\"p\">.<\/span><span class=\"nx\">name<\/span><span class=\"p\">}<\/span> <span class=\"o\">-<\/span> <span class=\"nx\">$<\/span><span class=\"p\">{<\/span><span class=\"nx\">item<\/span><span class=\"p\">.<\/span><span class=\"nx\">price<\/span><span class=\"p\">}<\/span>\n\n                        <span class=\"p\">{<\/span><span class=\"cm\">\/* Call the removeItemFromCart action when the remove button is clicked *\/<\/span><span class=\"p\">}<\/span>\n                        <span class=\"o\">&lt;<\/span><span class=\"nx\">button<\/span> <span class=\"nx\">onClick<\/span><span class=\"o\">=<\/span><span class=\"p\">{()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">actions<\/span><span class=\"p\">.<\/span><span class=\"nx\">removeItemFromCart<\/span><span class=\"p\">({<\/span> <span class=\"na\">itemIndex<\/span><span class=\"p\">:<\/span> <span class=\"nx\">index<\/span> <span class=\"p\">})}<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">Remove<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\n<\/span>                    <span class=\"o\">&lt;<\/span><span class=\"sr\">\/li<\/span><span class=\"err\">&gt;\n<\/span>                <span class=\"p\">))}<\/span>\n            <span class=\"o\">&lt;<\/span><span class=\"sr\">\/ul<\/span><span class=\"err\">&gt;\n<\/span>\n            <span class=\"p\">{<\/span><span class=\"cm\">\/* Call the addItemToCart action when the add item button is clicked *\/<\/span><span class=\"p\">}<\/span>\n            <span class=\"o\">&lt;<\/span><span class=\"nx\">button<\/span> <span class=\"nx\">onClick<\/span><span class=\"o\">=<\/span><span class=\"p\">{()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">actions<\/span><span class=\"p\">.<\/span><span class=\"nx\">addItemToCart<\/span><span class=\"p\">({<\/span> <span class=\"na\">item<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">Product<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"na\">price<\/span><span class=\"p\">:<\/span> <span class=\"mf\">9.99<\/span> <span class=\"p\">}<\/span> <span class=\"p\">})}<\/span><span class=\"o\">&gt;<\/span>\n                <span class=\"nx\">Add<\/span> <span class=\"nx\">Item<\/span>\n            <span class=\"o\">&lt;<\/span><span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\n<\/span>\n\n            <span class=\"p\">{<\/span><span class=\"cm\">\/* Allow the user to update the shipping address *\/<\/span><span class=\"p\">}<\/span>\n            <span class=\"o\">&lt;<\/span><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span>\n\n                <span class=\"o\">&lt;<\/span><span class=\"nx\">h4<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">Shipping<\/span> <span class=\"nx\">Address<\/span><span class=\"p\">:<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/h4<\/span><span class=\"err\">&gt;\n<\/span>\n                <span class=\"o\">&lt;<\/span><span class=\"nx\">input<\/span> <span class=\"nx\">type<\/span><span class=\"o\">=<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">text<\/span><span class=\"dl\">\"<\/span> <span class=\"nx\">placeholder<\/span><span class=\"o\">=<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">Street<\/span><span class=\"dl\">\"<\/span>\n                    <span class=\"nx\">value<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">cart<\/span><span class=\"p\">.<\/span><span class=\"nx\">shippingAddress<\/span><span class=\"p\">.<\/span><span class=\"nx\">street<\/span><span class=\"p\">}<\/span>\n                    <span class=\"nx\">onChange<\/span><span class=\"o\">=<\/span><span class=\"p\">{(<\/span><span class=\"nx\">e<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">actions<\/span><span class=\"p\">.<\/span><span class=\"nx\">updateShippingAddress<\/span><span class=\"p\">({<\/span> <span class=\"na\">shippingAddress<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"p\">...<\/span><span class=\"nx\">cart<\/span><span class=\"p\">.<\/span><span class=\"nx\">shippingAddress<\/span><span class=\"p\">,<\/span> <span class=\"na\">street<\/span><span class=\"p\">:<\/span> <span class=\"nx\">e<\/span><span class=\"p\">.<\/span><span class=\"nx\">target<\/span><span class=\"p\">.<\/span><span class=\"nx\">value<\/span> <span class=\"p\">}<\/span> <span class=\"p\">})}<\/span>\n                <span class=\"sr\">\/<\/span><span class=\"err\">&gt;\n<\/span>\n                <span class=\"o\">&lt;<\/span><span class=\"nx\">input<\/span> <span class=\"nx\">type<\/span><span class=\"o\">=<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">text<\/span><span class=\"dl\">\"<\/span> <span class=\"nx\">placeholder<\/span><span class=\"o\">=<\/span><span class=\"dl\">\"<\/span><span class=\"s2\">City<\/span><span class=\"dl\">\"<\/span>\n                    <span class=\"nx\">value<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">cart<\/span><span class=\"p\">.<\/span><span class=\"nx\">shippingAddress<\/span><span class=\"p\">.<\/span><span class=\"nx\">city<\/span><span class=\"p\">}<\/span>\n                    <span class=\"nx\">onChange<\/span><span class=\"o\">=<\/span><span class=\"p\">{(<\/span><span class=\"nx\">e<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">actions<\/span><span class=\"p\">.<\/span><span class=\"nx\">updateShippingAddress<\/span><span class=\"p\">({<\/span> <span class=\"na\">shippingAddress<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span> <span class=\"p\">...<\/span><span class=\"nx\">cart<\/span><span class=\"p\">.<\/span><span class=\"nx\">shippingAddress<\/span><span class=\"p\">,<\/span> <span class=\"na\">city<\/span><span class=\"p\">:<\/span> <span class=\"nx\">e<\/span><span class=\"p\">.<\/span><span class=\"nx\">target<\/span><span class=\"p\">.<\/span><span class=\"nx\">value<\/span> <span class=\"p\">}<\/span> <span class=\"p\">})}<\/span>\n                <span class=\"sr\">\/<\/span><span class=\"err\">&gt;\n<\/span>\n            <span class=\"o\">&lt;<\/span><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\n<\/span>\n            <span class=\"p\">{<\/span><span class=\"cm\">\/* Call the updateCart function with the initial state to clear the cart *\/<\/span><span class=\"p\">}<\/span>\n            <span class=\"o\">&lt;<\/span><span class=\"nx\">button<\/span> <span class=\"nx\">onClick<\/span><span class=\"o\">=<\/span><span class=\"p\">{()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">updateCart<\/span><span class=\"p\">(<\/span><span class=\"nx\">initialState<\/span><span class=\"p\">)}<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">Clear<\/span> <span class=\"nx\">Cart<\/span><span class=\"o\">&lt;<\/span><span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\n<\/span>\n        <span class=\"o\">&lt;<\/span><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\n<\/span>    <span class=\"p\">)<\/span>\n<span class=\"p\">}<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u062e\u0648\u062f\u0634\u0647.  \ud83d\ude03 \u0645\u0645\u0646\u0648\u0646 \u06a9\u0647 \u062e\u0648\u0627\u0646\u062f\u06cc\u062f.  \ud83c\udf89<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u062f\u0631 React\u060c useState \u0648 useReducer \u0645\u0639\u0645\u0648\u0644\u0627 \u0628\u0631\u0627\u06cc \u0645\u062f\u06cc\u0631\u06cc\u062a \u062f\u0648\u0644\u062a \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc \u0634\u0648\u062f. \u062f\u0631 \u062d\u0627\u0644\u06cc \u06a9\u0647 useImmer \u06cc\u06a9 \u062c\u0627\u06cc\u06af\u0632\u06cc\u0646 \u0645\u062d\u0628\u0648\u0628 \u0628\u0631\u0627\u06cc useState\u060c \u062f\u0631 \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647\u060c \u0628\u0631\u0631\u0633\u06cc \u062e\u0648\u0627\u0647\u06cc\u0645 \u06a9\u0631\u062f \u06a9\u0647 \u0686\u06af\u0648\u0646\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u06cc\u06a9 \u062c\u0627\u06cc\u06af\u0632\u06cc\u0646 \u0633\u0627\u062f\u0647 \u062a\u0631 \u0648 \u0645\u0648\u062b\u0631\u062a\u0631 \u0646\u06cc\u0632 \u0639\u0645\u0644 \u06a9\u0646\u062f useReducer. \u062f\u0631 \u0635\u0648\u0631\u062a\u06cc \u06a9\u0647 \u0647\u0646\u0648\u0632 \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0622\u0646 \u0622\u0634\u0646\u0627 \u0646\u06cc\u0633\u062a\u06cc\u062f useImmer \u0648 &hellip;<\/p>\n","protected":false},"author":2,"featured_media":8533,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[339],"tags":[],"class_list":["post-8532","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dev"],"_links":{"self":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts\/8532","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/comments?post=8532"}],"version-history":[{"count":0,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts\/8532\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media\/8533"}],"wp:attachment":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media?parent=8532"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/categories?post=8532"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/tags?post=8532"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}