{"id":74988,"date":"2024-08-28T17:55:29","date_gmt":"2024-08-28T14:25:29","guid":{"rendered":"https:\/\/nabfollower.com\/blog\/react-hooks-51l\/"},"modified":"2024-08-28T17:55:29","modified_gmt":"2024-08-28T14:25:29","slug":"react-hooks-51l","status":"publish","type":"post","link":"https:\/\/nabfollower.com\/blog\/react-hooks-51l\/","title":{"rendered":"React Hooks &#8211; \u0627\u0646\u062c\u0645\u0646 DEV"},"content":{"rendered":"<p>Summarize this content to 400 words in Persian Lang<br \/>\n            React Hook \u0647\u0627 \u062a\u0648\u0627\u0628\u0639\u06cc \u0647\u0633\u062a\u0646\u062f \u06a9\u0647 \u0628\u0647 \u0634\u0645\u0627 \u0627\u0645\u06a9\u0627\u0646 \u0645\u06cc \u062f\u0647\u0646\u062f \u0627\u0632 \u062d\u0627\u0644\u062a \u0648 \u0633\u0627\u06cc\u0631 \u0648\u06cc\u0698\u06af\u06cc \u0647\u0627\u06cc React \u062f\u0631 \u06a9\u0627\u0645\u067e\u0648\u0646\u0646\u062a \u0647\u0627\u06cc \u062a\u0627\u0628\u0639\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f\u060c \u06a9\u0647 \u0628\u0647 \u0637\u0648\u0631 \u0633\u0646\u062a\u06cc \u0641\u0642\u0637 \u062f\u0631 \u0645\u0624\u0644\u0641\u0647 \u0647\u0627\u06cc \u06a9\u0644\u0627\u0633 \u0645\u0648\u062c\u0648\u062f \u0628\u0648\u062f\u0646\u062f. \u0622\u0646\u0647\u0627 \u062f\u0631 React 16.8 \u0645\u0639\u0631\u0641\u06cc \u0634\u062f\u0646\u062f \u0648 \u0627\u0632 \u0622\u0646 \u0632\u0645\u0627\u0646 \u0628\u0647 \u0627\u0633\u062a\u0627\u0646\u062f\u0627\u0631\u062f\u06cc \u0628\u0631\u0627\u06cc \u0646\u0648\u0634\u062a\u0646 \u0627\u062c\u0632\u0627\u06cc React \u062a\u0628\u062f\u06cc\u0644 \u0634\u062f\u0647 \u0627\u0646\u062f. \u062f\u0631 \u0627\u06cc\u0646\u062c\u0627 \u062e\u0644\u0627\u0635\u0647 \u0627\u06cc \u0627\u0632 \u0645\u062a\u062f\u0627\u0648\u0644 \u062a\u0631\u06cc\u0646 \u0642\u0644\u0627\u0628 \u0647\u0627 \u0622\u0648\u0631\u062f\u0647 \u0634\u062f\u0647 \u0627\u0633\u062a:<\/p>\n<p>  1. \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0627\u06cc\u0627\u0644\u062a<\/p>\n<p>\u0647\u062f\u0641: \u062d\u0627\u0644\u062a \u0631\u0627 \u062f\u0631 \u0627\u062c\u0632\u0627\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f\u06cc \u0645\u062f\u06cc\u0631\u06cc\u062a \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<p>\u0627\u0633\u062a\u0641\u0627\u062f\u0647:<\/p>\n<p>  import React, { useState } from &#8216;react&#8217;;<\/p>\n<p>  function Counter() {<br \/>\n    const [count, setCount] = useState(0); \/\/ Declare a state variable called &#8216;count&#8217;<\/p>\n<p>    return (<br \/>\n      div&gt;<br \/>\n        p&gt;You clicked {count} times\/p&gt;<br \/>\n        button onClick={() =&gt; setCount(count + 1)}&gt;<br \/>\n          Click me<br \/>\n        \/button&gt;<br \/>\n      \/div&gt;<br \/>\n    );<br \/>\n  }<\/p>\n<p>    \u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/p>\n<p>    \u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/p>\n<p>\u062a\u0648\u0636\u06cc\u062d: useState \u0622\u0631\u0627\u06cc\u0647 \u0627\u06cc \u0631\u0627 \u0628\u0627 \u062f\u0648 \u0639\u0646\u0635\u0631 \u0628\u0631\u0645\u06cc \u06af\u0631\u062f\u0627\u0646\u062f: \u0645\u0642\u062f\u0627\u0631 \u0641\u0639\u0644\u06cc (count) \u0648 \u06cc\u06a9 \u062a\u0627\u0628\u0639 \u0628\u0631\u0627\u06cc \u0628\u0647 \u0631\u0648\u0632 \u0631\u0633\u0627\u0646\u06cc \u0622\u0646 (setCount). \u0627\u06cc\u0646 \u0628\u0647 \u0634\u0645\u0627 \u0627\u0645\u06a9\u0627\u0646 \u0645\u06cc \u062f\u0647\u062f \u0648\u0636\u0639\u06cc\u062a \u0631\u0627 \u062f\u0631 \u06cc\u06a9 \u062c\u0632\u0621 \u0639\u0645\u0644\u06a9\u0631\u062f\u06cc \u062d\u0641\u0638 \u0648 \u0628\u0647 \u0631\u0648\u0632 \u06a9\u0646\u06cc\u062f.<\/p>\n<p>  2. useEffect<\/p>\n<p>\u0647\u062f\u0641: \u0639\u0648\u0627\u0631\u0636 \u062c\u0627\u0646\u0628\u06cc \u0645\u0627\u0646\u0646\u062f \u0648\u0627\u06a9\u0634\u06cc \u062f\u0627\u062f\u0647 \u0647\u0627\u060c \u0627\u0634\u062a\u0631\u0627\u06a9 \u0647\u0627\u060c \u06cc\u0627 \u062a\u063a\u06cc\u06cc\u0631 \u062f\u0633\u062a\u06cc DOM \u062f\u0631 \u0627\u062c\u0632\u0627\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f\u06cc \u0631\u0627 \u06a9\u0646\u062a\u0631\u0644 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<p>\u0627\u0633\u062a\u0641\u0627\u062f\u0647:<\/p>\n<p>  import React, { useEffect, useState } from &#8216;react&#8217;;<\/p>\n<p>  function Example() {<br \/>\n    const [data, setData] = useState(null);<\/p>\n<p>    useEffect(() =&gt; {<br \/>\n      fetch(&#8216;https:\/\/api.example.com\/data&#8217;)<br \/>\n        .then(response =&gt; response.json())<br \/>\n        .then(data =&gt; setData(data));<br \/>\n    }, []); \/\/ Empty dependency array means this effect runs once after the initial render.<\/p>\n<p>    return div&gt;{data ? data : &#8216;Loading&#8230;&#8217;}\/div&gt;;<br \/>\n  }<\/p>\n<p>    \u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/p>\n<p>    \u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/p>\n<p>\u062a\u0648\u0636\u06cc\u062d: useEffect \u062f\u0648 \u0622\u0631\u06af\u0648\u0645\u0627\u0646 \u0645\u06cc \u06af\u06cc\u0631\u062f: \u06cc\u06a9 \u062a\u0627\u0628\u0639 \u0628\u0631\u0627\u06cc \u0627\u062c\u0631\u0627\u06cc \u0627\u0641\u06a9\u062a \u0648 \u06cc\u06a9 \u0622\u0631\u0627\u06cc\u0647 \u0648\u0627\u0628\u0633\u062a\u06af\u06cc \u0627\u062e\u062a\u06cc\u0627\u0631\u06cc. \u062a\u0627\u0628\u0639 \u0627\u0641\u06a9\u062a \u067e\u0633 \u0627\u0632 \u0631\u0646\u062f\u0631 \u0634\u062f\u0646 \u0645\u0624\u0644\u0641\u0647 \u0627\u062c\u0631\u0627 \u0645\u06cc \u0634\u0648\u062f. \u0627\u06af\u0631 \u06cc\u06a9 \u0622\u0631\u0627\u06cc\u0647 \u0648\u0627\u0628\u0633\u062a\u06af\u06cc \u0627\u0631\u0627\u0626\u0647 \u06a9\u0646\u06cc\u062f\u060c \u0627\u062b\u0631 \u0641\u0642\u0637 \u0632\u0645\u0627\u0646\u06cc \u0627\u062c\u0631\u0627 \u0645\u06cc \u0634\u0648\u062f \u06a9\u0647 \u0622\u0646 \u0648\u0627\u0628\u0633\u062a\u06af\u06cc \u0647\u0627 \u062a\u063a\u06cc\u06cc\u0631 \u06a9\u0646\u0646\u062f.<\/p>\n<p>  3. useContext<\/p>\n<p>\u0647\u062f\u0641: \u0628\u0647 \u0645\u0642\u062f\u0627\u0631 \u06cc\u06a9 \u0645\u062a\u0646 \u062f\u0631 \u06cc\u06a9 \u062c\u0632\u0621 \u062a\u0627\u0628\u0639\u06cc \u062f\u0633\u062a\u0631\u0633\u06cc \u067e\u06cc\u062f\u0627 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<p>\u0627\u0633\u062a\u0641\u0627\u062f\u0647:<\/p>\n<p>  import React, { useContext } from &#8216;react&#8217;;<br \/>\n  const ThemeContext = React.createContext(&#8216;light&#8217;);<\/p>\n<p>  function DisplayTheme() {<br \/>\n    const theme = useContext(ThemeContext); \/\/ Access the current theme context value<\/p>\n<p>    return div&gt;The current theme is {theme}\/div&gt;;<br \/>\n  }<\/p>\n<p>    \u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/p>\n<p>    \u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/p>\n<p>\u062a\u0648\u0636\u06cc\u062d: useContext \u0628\u0647 \u0634\u0645\u0627 \u0627\u06cc\u0646 \u0627\u0645\u06a9\u0627\u0646 \u0631\u0627 \u0645\u06cc \u062f\u0647\u062f \u06a9\u0647 \u0645\u0642\u0627\u062f\u06cc\u0631 \u0645\u062a\u0646 \u0631\u0627 \u0645\u0633\u062a\u0642\u06cc\u0645\u0627\u064b \u062f\u0631 \u0627\u062c\u0632\u0627\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f\u06cc \u0628\u062f\u0648\u0646 \u0646\u06cc\u0627\u0632 \u0628\u0647 a \u0645\u0635\u0631\u0641 \u06a9\u0646\u06cc\u062f Consumer \u062c\u0632\u0621<\/p>\n<p>  4. \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u06a9\u0627\u0647\u0634 \u062f\u0647\u0646\u062f\u0647<\/p>\n<p>\u0647\u062f\u0641: \u0645\u0646\u0637\u0642 \u062d\u0627\u0644\u062a \u067e\u06cc\u0686\u06cc\u062f\u0647 \u0631\u0627 \u062f\u0631 \u0627\u062c\u0632\u0627\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f\u06cc \u0645\u062f\u06cc\u0631\u06cc\u062a \u0645\u06cc \u06a9\u0646\u062f \u0648 \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u062c\u0627\u06cc\u06af\u0632\u06cc\u0646\u06cc \u0628\u0631\u0627\u06cc \u0622\u0646 \u0639\u0645\u0644 \u0645\u06cc \u06a9\u0646\u062f useState.<\/p>\n<p>\u0627\u0633\u062a\u0641\u0627\u062f\u0647:<\/p>\n<p>  import React, { useReducer } from &#8216;react&#8217;;<\/p>\n<p>  function reducer(state, action) {<br \/>\n    switch (action.type) {<br \/>\n      case &#8216;increment&#8217;:<br \/>\n        return { count: state.count + 1 };<br \/>\n      case &#8216;decrement&#8217;:<br \/>\n        return { count: state.count &#8211; 1 };<br \/>\n      default:<br \/>\n        return state;<br \/>\n    }<br \/>\n  }<\/p>\n<p>  function Counter() {<br \/>\n    const [state, dispatch] = useReducer(reducer, { count: 0 });<\/p>\n<p>    return (<br \/>\n      div&gt;<br \/>\n        p&gt;Count: {state.count}\/p&gt;<br \/>\n        button onClick={() =&gt; dispatch({ type: &#8216;increment&#8217; })}&gt;+\/button&gt;<br \/>\n        button onClick={() =&gt; dispatch({ type: &#8216;decrement&#8217; })}&gt;-\/button&gt;<br \/>\n      \/div&gt;<br \/>\n    );<br \/>\n  }<\/p>\n<p>    \u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/p>\n<p>    \u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/p>\n<p>\u062a\u0648\u0636\u06cc\u062d: useReducer \u0628\u0631\u0627\u06cc \u0645\u062f\u06cc\u0631\u06cc\u062a \u062d\u0627\u0644\u062a\u06cc \u06a9\u0647 \u0628\u0647 \u0645\u0646\u0637\u0642 \u067e\u06cc\u0686\u06cc\u062f\u0647 \u062a\u0631 \u06cc\u0627 \u0627\u0642\u062f\u0627\u0645\u0627\u062a \u0645\u062a\u0639\u062f\u062f \u0628\u0633\u062a\u06af\u06cc \u062f\u0627\u0631\u062f \u0645\u0641\u06cc\u062f \u0627\u0633\u062a. \u06cc\u06a9 \u062a\u0627\u0628\u0639 \u06a9\u0627\u0647\u0646\u062f\u0647 \u0648 \u06cc\u06a9 \u062d\u0627\u0644\u062a \u0627\u0648\u0644\u06cc\u0647 \u0645\u06cc \u06af\u06cc\u0631\u062f \u0648 \u062d\u0627\u0644\u062a \u0641\u0639\u0644\u06cc \u0648 a \u0631\u0627 \u0628\u0631\u0645\u06cc \u06af\u0631\u062f\u0627\u0646\u062f dispatch \u062a\u0627\u0628\u0639<\/p>\n<p>  5. useRef<\/p>\n<p>\u0647\u062f\u0641: \u0628\u0647 \u06cc\u06a9 \u0645\u0631\u062c\u0639 \u062a\u063a\u06cc\u06cc\u0631\u067e\u0630\u06cc\u0631 \u0628\u0647 \u06cc\u06a9 \u0639\u0646\u0635\u0631 \u06cc\u0627 \u0645\u0642\u062f\u0627\u0631 DOM \u06a9\u0647 \u062f\u0631 \u0633\u0631\u0627\u0633\u0631 \u0631\u0646\u062f\u0631\u0647\u0627 \u0628\u0627\u0642\u06cc \u0645\u06cc \u0645\u0627\u0646\u062f \u062f\u0633\u062a\u0631\u0633\u06cc \u067e\u06cc\u062f\u0627 \u0645\u06cc \u06a9\u0646\u062f \u0648 \u0630\u062e\u06cc\u0631\u0647 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<p>\u0627\u0633\u062a\u0641\u0627\u062f\u0647:<\/p>\n<p>  import React, { useRef, useEffect } from &#8216;react&#8217;;<\/p>\n<p>  function TextInputWithFocusButton() {<br \/>\n    const inputEl = useRef(null);<\/p>\n<p>    const onButtonClick = () =&gt; {<br \/>\n      inputEl.current.focus(); \/\/ Access the DOM element directly<br \/>\n    };<\/p>\n<p>    return (<\/p>\n<p>        input ref={inputEl} type=&#8221;text&#8221; \/&gt;<br \/>\n        button onClick={onButtonClick}&gt;Focus the input\/button&gt;<br \/>\n      \/&gt;<br \/>\n    );<br \/>\n  }<\/p>\n<p>    \u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/p>\n<p>    \u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/p>\n<p>\u062a\u0648\u0636\u06cc\u062d: useRef \u06cc\u06a9 \u0634\u06cc\u0621 \u0642\u0627\u0628\u0644 \u062a\u063a\u06cc\u06cc\u0631 \u0631\u0627 \u0628\u0627 a \u0628\u0631\u0645\u06cc \u06af\u0631\u062f\u0627\u0646\u062f .current \u0648\u06cc\u0698\u06af\u06cc \u06a9\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0645\u0642\u062f\u0627\u0631 \u06cc\u0627 \u0627\u0631\u062c\u0627\u0639 \u0628\u0647 \u0639\u0646\u0635\u0631 DOM \u0631\u0627 \u062f\u0631 \u062e\u0648\u062f \u062c\u0627\u06cc \u062f\u0647\u062f. \u0627\u06cc\u0646 \u0645\u0642\u062f\u0627\u0631 \u062f\u0631 \u062a\u0645\u0627\u0645 \u0631\u0646\u062f\u0631\u0647\u0627 \u0628\u062f\u0648\u0646 \u0627\u06cc\u062c\u0627\u062f \u0631\u0646\u062f\u0631\u0647\u0627\u06cc \u0645\u062c\u062f\u062f \u0647\u0646\u06af\u0627\u0645 \u0628\u0647\u200c\u0631\u0648\u0632\u0631\u0633\u0627\u0646\u06cc \u0628\u0627\u0642\u06cc \u0645\u06cc\u200c\u0645\u0627\u0646\u062f.<\/p>\n<p>  6. useMemo \u0648 useCallback<\/p>\n<p>\u0647\u062f\u0641: \u0628\u0627 \u0628\u0647 \u062e\u0627\u0637\u0631 \u0633\u067e\u0631\u062f\u0646 \u0645\u062d\u0627\u0633\u0628\u0627\u062a \u06cc\u0627 \u062a\u0648\u0627\u0628\u0639 \u06af\u0631\u0627\u0646 \u0642\u06cc\u0645\u062a\u060c \u0639\u0645\u0644\u06a9\u0631\u062f \u0631\u0627 \u0628\u0647\u06cc\u0646\u0647 \u06a9\u0646\u06cc\u062f.<\/p>\n<p>\u0627\u0633\u062a\u0641\u0627\u062f\u0647:<\/p>\n<p>  import React, { useMemo, useCallback } from &#8216;react&#8217;;<\/p>\n<p>  function Example({ items }) {<br \/>\n    const expensiveCalculation = useMemo(() =&gt; {<br \/>\n      return items.reduce((a, b) =&gt; a + b, 0);<br \/>\n    }, [items]);<\/p>\n<p>    const memoizedCallback = useCallback(() =&gt; {<br \/>\n      console.log(&#8216;This function is memoized&#8217;);<br \/>\n    }, []);<\/p>\n<p>    return div&gt;{expensiveCalculation}\/div&gt;;<br \/>\n  }<\/p>\n<p>    \u0648\u0627\u0631\u062f \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0634\u0648\u06cc\u062f<\/p>\n<p>    \u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/p>\n<p>\u062a\u0648\u0636\u06cc\u062d: useMemo \u06cc\u06a9 \u0645\u0642\u062f\u0627\u0631 \u0645\u062d\u0627\u0633\u0628\u0647 \u0634\u062f\u0647 \u0631\u0627 \u0628\u0647 \u062e\u0627\u0637\u0631 \u0645\u06cc \u0633\u067e\u0627\u0631\u062f \u0648 \u062a\u0646\u0647\u0627 \u0632\u0645\u0627\u0646\u06cc \u0622\u0646 \u0631\u0627 \u062f\u0648\u0628\u0627\u0631\u0647 \u0645\u062d\u0627\u0633\u0628\u0647 \u0645\u06cc \u06a9\u0646\u062f \u06a9\u0647 \u0648\u0627\u0628\u0633\u062a\u06af\u06cc \u0647\u0627\u06cc \u0622\u0646 \u062a\u063a\u06cc\u06cc\u0631 \u06a9\u0646\u062f. useCallback \u06cc\u06a9 \u062a\u0627\u0628\u0639 \u0631\u0627 \u0628\u0647 \u062e\u0627\u0637\u0631 \u0645\u06cc\u200c\u0633\u067e\u0627\u0631\u062f \u0648 \u0627\u0637\u0645\u06cc\u0646\u0627\u0646 \u0645\u06cc\u200c\u062f\u0647\u062f \u06a9\u0647 \u062a\u0646\u0647\u0627 \u0632\u0645\u0627\u0646\u06cc \u06a9\u0647 \u0648\u0627\u0628\u0633\u062a\u06af\u06cc\u200c\u0647\u0627\u06cc \u0622\u0646 \u062a\u063a\u06cc\u06cc\u0631 \u0645\u06cc\u200c\u06a9\u0646\u062f\u060c \u062f\u0648\u0628\u0627\u0631\u0647 \u062a\u0639\u0631\u06cc\u0641 \u0645\u06cc\u200c\u0634\u0648\u062f.<\/p>\n<p>  \u0686\u0631\u0627 \u0642\u0644\u0627\u0628 \u0647\u0627 \u0645\u0641\u06cc\u062f \u0647\u0633\u062a\u0646\u062f<\/p>\n<p>\u06a9\u062f \u067e\u0627\u06a9 \u06a9\u0646\u0646\u062f\u0647: \u0642\u0644\u0627\u0628 \u0647\u0627 \u0628\u0647 \u0634\u0645\u0627 \u0627\u0645\u06a9\u0627\u0646 \u0645\u06cc \u062f\u0647\u0646\u062f \u0628\u062f\u0648\u0646 \u0646\u06cc\u0627\u0632 \u0628\u0647 \u0627\u062c\u0632\u0627\u06cc \u06a9\u0644\u0627\u0633\u060c \u06a9\u062f\u0647\u0627\u06cc \u062a\u0645\u06cc\u0632\u062a\u0631 \u0648 \u062e\u0648\u0627\u0646\u0627\u062a\u0631 \u0628\u0646\u0648\u06cc\u0633\u06cc\u062f.<\/p>\n<p>\u0642\u0627\u0628\u0644\u06cc\u062a \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u062c\u062f\u062f: \u0642\u0644\u0627\u0628 \u0647\u0627 \u0631\u0627 \u0645\u06cc \u062a\u0648\u0627\u0646 \u0645\u062c\u062f\u062f\u0627\u064b \u062f\u0631 \u0627\u062c\u0632\u0627\u06cc \u0645\u062e\u062a\u0644\u0641 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0631\u062f \u06cc\u0627 \u062d\u062a\u06cc \u0628\u06cc\u0646 \u067e\u0631\u0648\u0698\u0647 \u0647\u0627 \u0628\u0647 \u0627\u0634\u062a\u0631\u0627\u06a9 \u06af\u0630\u0627\u0634\u062a.<\/p>\n<p>\u0645\u0646\u0637\u0642 \u062d\u0627\u0644\u062a \u062f\u0631 \u0645\u0648\u0644\u0641\u0647 \u0647\u0627\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f\u06cc: \u0642\u0644\u0627\u0628 \u0647\u0627 \u0634\u0645\u0627 \u0631\u0627 \u0642\u0627\u062f\u0631 \u0645\u06cc \u0633\u0627\u0632\u0646\u062f \u062a\u0627 \u062d\u0627\u0644\u062a \u0648 \u0639\u0648\u0627\u0631\u0636 \u062c\u0627\u0646\u0628\u06cc \u0631\u0627 \u062f\u0631 \u0627\u062c\u0632\u0627\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f\u06cc \u0645\u062f\u06cc\u0631\u06cc\u062a \u06a9\u0646\u06cc\u062f \u0648 \u0622\u0646\u0647\u0627 \u0631\u0627 \u0628\u0647 \u0627\u0646\u062f\u0627\u0632\u0647 \u0627\u062c\u0632\u0627\u06cc \u06a9\u0644\u0627\u0633 \u0642\u062f\u0631\u062a\u0645\u0646\u062f \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<p>\u0647\u0648\u06a9\u200c\u0647\u0627 \u0631\u0648\u0634\u06cc \u0631\u0627 \u06a9\u0647 \u062a\u0648\u0633\u0639\u0647\u200c\u062f\u0647\u0646\u062f\u06af\u0627\u0646 \u0628\u0631\u0646\u0627\u0645\u0647\u200c\u0647\u0627\u06cc React \u0645\u06cc\u200c\u0646\u0648\u06cc\u0633\u0646\u062f \u062a\u063a\u06cc\u06cc\u0631 \u062f\u0627\u062f\u0647\u200c\u0627\u0646\u062f\u060c \u0648 \u0645\u0624\u0644\u0641\u0647\u200c\u0647\u0627\u06cc \u06a9\u0627\u0631\u0628\u0631\u062f\u06cc \u0631\u0627 \u0642\u0627\u0628\u0644\u06cc\u062a\u200c\u062a\u0631 \u0648 \u0645\u062f\u06cc\u0631\u06cc\u062a \u0622\u0633\u0627\u0646\u200c\u062a\u0631 \u06a9\u0631\u062f\u0647\u200c\u0627\u0646\u062f.<\/p>\n<div data-article-id=\"1977504\" id=\"article-body\">\n<p>React Hook \u0647\u0627 \u062a\u0648\u0627\u0628\u0639\u06cc \u0647\u0633\u062a\u0646\u062f \u06a9\u0647 \u0628\u0647 \u0634\u0645\u0627 \u0627\u0645\u06a9\u0627\u0646 \u0645\u06cc \u062f\u0647\u0646\u062f \u0627\u0632 \u062d\u0627\u0644\u062a \u0648 \u0633\u0627\u06cc\u0631 \u0648\u06cc\u0698\u06af\u06cc \u0647\u0627\u06cc React \u062f\u0631 \u06a9\u0627\u0645\u067e\u0648\u0646\u0646\u062a \u0647\u0627\u06cc \u062a\u0627\u0628\u0639\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f\u060c \u06a9\u0647 \u0628\u0647 \u0637\u0648\u0631 \u0633\u0646\u062a\u06cc \u0641\u0642\u0637 \u062f\u0631 \u0645\u0624\u0644\u0641\u0647 \u0647\u0627\u06cc \u06a9\u0644\u0627\u0633 \u0645\u0648\u062c\u0648\u062f \u0628\u0648\u062f\u0646\u062f. \u0622\u0646\u0647\u0627 \u062f\u0631 React 16.8 \u0645\u0639\u0631\u0641\u06cc \u0634\u062f\u0646\u062f \u0648 \u0627\u0632 \u0622\u0646 \u0632\u0645\u0627\u0646 \u0628\u0647 \u0627\u0633\u062a\u0627\u0646\u062f\u0627\u0631\u062f\u06cc \u0628\u0631\u0627\u06cc \u0646\u0648\u0634\u062a\u0646 \u0627\u062c\u0632\u0627\u06cc React \u062a\u0628\u062f\u06cc\u0644 \u0634\u062f\u0647 \u0627\u0646\u062f. \u062f\u0631 \u0627\u06cc\u0646\u062c\u0627 \u062e\u0644\u0627\u0635\u0647 \u0627\u06cc \u0627\u0632 \u0645\u062a\u062f\u0627\u0648\u0644 \u062a\u0631\u06cc\u0646 \u0642\u0644\u0627\u0628 \u0647\u0627 \u0622\u0648\u0631\u062f\u0647 \u0634\u062f\u0647 \u0627\u0633\u062a:<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 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=\"\u062a\u063a\u06cc\u06cc\u0631 \u0648\u0636\u0639\u06cc\u062a \u0641\u0647\u0631\u0633\u062a \u0645\u0637\u0627\u0644\u0628\"><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\/react-hooks-51l\/#1_%D8%A7%D8%B3%D8%AA%D9%81%D8%A7%D8%AF%D9%87_%D8%A7%D8%B2_%D8%A7%DB%8C%D8%A7%D9%84%D8%AA\" >1. \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0627\u06cc\u0627\u0644\u062a<\/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\/react-hooks-51l\/#2_useEffect\" >2. useEffect<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/nabfollower.com\/blog\/react-hooks-51l\/#3_useContext\" >3. useContext<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/nabfollower.com\/blog\/react-hooks-51l\/#4_%D8%A7%D8%B3%D8%AA%D9%81%D8%A7%D8%AF%D9%87_%D8%A7%D8%B2_%DA%A9%D8%A7%D9%87%D8%B4_%D8%AF%D9%87%D9%86%D8%AF%D9%87\" >4. \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u06a9\u0627\u0647\u0634 \u062f\u0647\u0646\u062f\u0647<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/nabfollower.com\/blog\/react-hooks-51l\/#5_useRef\" >5. useRef<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/nabfollower.com\/blog\/react-hooks-51l\/#6_useMemo_%D9%88_useCallback\" >6. useMemo \u0648 useCallback<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/nabfollower.com\/blog\/react-hooks-51l\/#%DA%86%D8%B1%D8%A7_%D9%82%D9%84%D8%A7%D8%A8_%D9%87%D8%A7_%D9%85%D9%81%DB%8C%D8%AF_%D9%87%D8%B3%D8%AA%D9%86%D8%AF\" >\u0686\u0631\u0627 \u0642\u0644\u0627\u0628 \u0647\u0627 \u0645\u0641\u06cc\u062f \u0647\u0633\u062a\u0646\u062f<\/a><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"1_%D8%A7%D8%B3%D8%AA%D9%81%D8%A7%D8%AF%D9%87_%D8%A7%D8%B2_%D8%A7%DB%8C%D8%A7%D9%84%D8%AA\"><\/span>\n<p>  1. <strong>\u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0627\u06cc\u0627\u0644\u062a<\/strong><br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<strong>\u0647\u062f\u0641<\/strong>: \u062d\u0627\u0644\u062a \u0631\u0627 \u062f\u0631 \u0627\u062c\u0632\u0627\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f\u06cc \u0645\u062f\u06cc\u0631\u06cc\u062a \u0645\u06cc \u06a9\u0646\u062f.<\/li>\n<li>\n<strong>\u0627\u0633\u062a\u0641\u0627\u062f\u0647<\/strong>:\n<\/li>\n<\/ul>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code>  <span class=\"k\">import<\/span> <span class=\"nx\">React<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useState<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\n\n  <span class=\"kd\">function<\/span> <span class=\"nf\">Counter<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\n    <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">count<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setCount<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">);<\/span> <span class=\"c1\">\/\/ Declare a state variable called 'count'<\/span>\n\n    <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\n      <span class=\"o\"><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span>\n        <span class=\"o\"><span class=\"nx\">p<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">You<\/span> <span class=\"nx\">clicked<\/span> <span class=\"p\">{<\/span><span class=\"nx\">count<\/span><span class=\"p\">}<\/span> <span class=\"nx\">times<\/span><span class=\"o\"><span class=\"sr\">\/p<\/span><span class=\"err\">&gt;\n<\/span>        <span class=\"o\"><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=\"nf\">setCount<\/span><span class=\"p\">(<\/span><span class=\"nx\">count<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"p\">)}<\/span><span class=\"o\">&gt;<\/span>\n          <span class=\"nx\">Click<\/span> <span class=\"nx\">me<\/span>\n        <span class=\"o\"><span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\n<\/span>      <span class=\"o\"><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\n<\/span>    <span class=\"p\">);<\/span>\n  <span class=\"p\">}<\/span>\n<\/span><\/span><\/span><\/span><\/span><\/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<ul>\n<li>\n<strong>\u062a\u0648\u0636\u06cc\u062d<\/strong>: <code>useState<\/code> \u0622\u0631\u0627\u06cc\u0647 \u0627\u06cc \u0631\u0627 \u0628\u0627 \u062f\u0648 \u0639\u0646\u0635\u0631 \u0628\u0631\u0645\u06cc \u06af\u0631\u062f\u0627\u0646\u062f: \u0645\u0642\u062f\u0627\u0631 \u0641\u0639\u0644\u06cc (<code>count<\/code>) \u0648 \u06cc\u06a9 \u062a\u0627\u0628\u0639 \u0628\u0631\u0627\u06cc \u0628\u0647 \u0631\u0648\u0632 \u0631\u0633\u0627\u0646\u06cc \u0622\u0646 (<code>setCount<\/code>). \u0627\u06cc\u0646 \u0628\u0647 \u0634\u0645\u0627 \u0627\u0645\u06a9\u0627\u0646 \u0645\u06cc \u062f\u0647\u062f \u0648\u0636\u0639\u06cc\u062a \u0631\u0627 \u062f\u0631 \u06cc\u06a9 \u062c\u0632\u0621 \u0639\u0645\u0644\u06a9\u0631\u062f\u06cc \u062d\u0641\u0638 \u0648 \u0628\u0647 \u0631\u0648\u0632 \u06a9\u0646\u06cc\u062f.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"2_useEffect\"><\/span>\n<p>  2. <strong>useEffect<\/strong><br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<strong>\u0647\u062f\u0641<\/strong>: \u0639\u0648\u0627\u0631\u0636 \u062c\u0627\u0646\u0628\u06cc \u0645\u0627\u0646\u0646\u062f \u0648\u0627\u06a9\u0634\u06cc \u062f\u0627\u062f\u0647 \u0647\u0627\u060c \u0627\u0634\u062a\u0631\u0627\u06a9 \u0647\u0627\u060c \u06cc\u0627 \u062a\u063a\u06cc\u06cc\u0631 \u062f\u0633\u062a\u06cc DOM \u062f\u0631 \u0627\u062c\u0632\u0627\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f\u06cc \u0631\u0627 \u06a9\u0646\u062a\u0631\u0644 \u0645\u06cc \u06a9\u0646\u062f.<\/li>\n<li>\n<strong>\u0627\u0633\u062a\u0641\u0627\u062f\u0647<\/strong>:\n<\/li>\n<\/ul>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code>  <span class=\"k\">import<\/span> <span class=\"nx\">React<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useEffect<\/span><span class=\"p\">,<\/span> <span class=\"nx\">useState<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\n\n  <span class=\"kd\">function<\/span> <span class=\"nf\">Example<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\n    <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">data<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setData<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"kc\">null<\/span><span class=\"p\">);<\/span>\n\n    <span class=\"nf\">useEffect<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n      <span class=\"nf\">fetch<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">https:\/\/api.example.com\/data<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span>\n        <span class=\"p\">.<\/span><span class=\"nf\">then<\/span><span class=\"p\">(<\/span><span class=\"nx\">response<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">response<\/span><span class=\"p\">.<\/span><span class=\"nf\">json<\/span><span class=\"p\">())<\/span>\n        <span class=\"p\">.<\/span><span class=\"nf\">then<\/span><span class=\"p\">(<\/span><span class=\"nx\">data<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nf\">setData<\/span><span class=\"p\">(<\/span><span class=\"nx\">data<\/span><span class=\"p\">));<\/span>\n    <span class=\"p\">},<\/span> <span class=\"p\">[]);<\/span> <span class=\"c1\">\/\/ Empty dependency array means this effect runs once after the initial render.<\/span>\n\n    <span class=\"k\">return<\/span> <span class=\"o\"><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">{<\/span><span class=\"nx\">data<\/span> <span class=\"p\">?<\/span> <span class=\"nx\">data<\/span> <span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">Loading...<\/span><span class=\"dl\">'<\/span><span class=\"p\">}<\/span><span class=\"o\"><span class=\"sr\">\/div&gt;<\/span><span class=\"err\">;\n<\/span>  <span class=\"p\">}<\/span>\n<\/span><\/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<ul>\n<li>\n<strong>\u062a\u0648\u0636\u06cc\u062d<\/strong>: <code>useEffect<\/code> \u062f\u0648 \u0622\u0631\u06af\u0648\u0645\u0627\u0646 \u0645\u06cc \u06af\u06cc\u0631\u062f: \u06cc\u06a9 \u062a\u0627\u0628\u0639 \u0628\u0631\u0627\u06cc \u0627\u062c\u0631\u0627\u06cc \u0627\u0641\u06a9\u062a \u0648 \u06cc\u06a9 \u0622\u0631\u0627\u06cc\u0647 \u0648\u0627\u0628\u0633\u062a\u06af\u06cc \u0627\u062e\u062a\u06cc\u0627\u0631\u06cc. \u062a\u0627\u0628\u0639 \u0627\u0641\u06a9\u062a \u067e\u0633 \u0627\u0632 \u0631\u0646\u062f\u0631 \u0634\u062f\u0646 \u0645\u0624\u0644\u0641\u0647 \u0627\u062c\u0631\u0627 \u0645\u06cc \u0634\u0648\u062f. \u0627\u06af\u0631 \u06cc\u06a9 \u0622\u0631\u0627\u06cc\u0647 \u0648\u0627\u0628\u0633\u062a\u06af\u06cc \u0627\u0631\u0627\u0626\u0647 \u06a9\u0646\u06cc\u062f\u060c \u0627\u062b\u0631 \u0641\u0642\u0637 \u0632\u0645\u0627\u0646\u06cc \u0627\u062c\u0631\u0627 \u0645\u06cc \u0634\u0648\u062f \u06a9\u0647 \u0622\u0646 \u0648\u0627\u0628\u0633\u062a\u06af\u06cc \u0647\u0627 \u062a\u063a\u06cc\u06cc\u0631 \u06a9\u0646\u0646\u062f.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"3_useContext\"><\/span>\n<p>  3. <strong>useContext<\/strong><br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<strong>\u0647\u062f\u0641<\/strong>: \u0628\u0647 \u0645\u0642\u062f\u0627\u0631 \u06cc\u06a9 \u0645\u062a\u0646 \u062f\u0631 \u06cc\u06a9 \u062c\u0632\u0621 \u062a\u0627\u0628\u0639\u06cc \u062f\u0633\u062a\u0631\u0633\u06cc \u067e\u06cc\u062f\u0627 \u0645\u06cc \u06a9\u0646\u062f.<\/li>\n<li>\n<strong>\u0627\u0633\u062a\u0641\u0627\u062f\u0647<\/strong>:\n<\/li>\n<\/ul>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code>  <span class=\"k\">import<\/span> <span class=\"nx\">React<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useContext<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\n  <span class=\"kd\">const<\/span> <span class=\"nx\">ThemeContext<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">React<\/span><span class=\"p\">.<\/span><span class=\"nf\">createContext<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">light<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\n\n  <span class=\"kd\">function<\/span> <span class=\"nf\">DisplayTheme<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\n    <span class=\"kd\">const<\/span> <span class=\"nx\">theme<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useContext<\/span><span class=\"p\">(<\/span><span class=\"nx\">ThemeContext<\/span><span class=\"p\">);<\/span> <span class=\"c1\">\/\/ Access the current theme context value<\/span>\n\n    <span class=\"k\">return<\/span> <span class=\"o\"><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">The<\/span> <span class=\"nx\">current<\/span> <span class=\"nx\">theme<\/span> <span class=\"nx\">is<\/span> <span class=\"p\">{<\/span><span class=\"nx\">theme<\/span><span class=\"p\">}<\/span><span class=\"o\"><span class=\"sr\">\/div&gt;<\/span><span class=\"err\">;\n<\/span>  <span class=\"p\">}<\/span>\n<\/span><\/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<ul>\n<li>\n<strong>\u062a\u0648\u0636\u06cc\u062d<\/strong>: <code>useContext<\/code> \u0628\u0647 \u0634\u0645\u0627 \u0627\u06cc\u0646 \u0627\u0645\u06a9\u0627\u0646 \u0631\u0627 \u0645\u06cc \u062f\u0647\u062f \u06a9\u0647 \u0645\u0642\u0627\u062f\u06cc\u0631 \u0645\u062a\u0646 \u0631\u0627 \u0645\u0633\u062a\u0642\u06cc\u0645\u0627\u064b \u062f\u0631 \u0627\u062c\u0632\u0627\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f\u06cc \u0628\u062f\u0648\u0646 \u0646\u06cc\u0627\u0632 \u0628\u0647 a \u0645\u0635\u0631\u0641 \u06a9\u0646\u06cc\u062f <code>Consumer<\/code> \u062c\u0632\u0621<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"4_%D8%A7%D8%B3%D8%AA%D9%81%D8%A7%D8%AF%D9%87_%D8%A7%D8%B2_%DA%A9%D8%A7%D9%87%D8%B4_%D8%AF%D9%87%D9%86%D8%AF%D9%87\"><\/span>\n<p>  4. <strong>\u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u06a9\u0627\u0647\u0634 \u062f\u0647\u0646\u062f\u0647<\/strong><br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<strong>\u0647\u062f\u0641<\/strong>: \u0645\u0646\u0637\u0642 \u062d\u0627\u0644\u062a \u067e\u06cc\u0686\u06cc\u062f\u0647 \u0631\u0627 \u062f\u0631 \u0627\u062c\u0632\u0627\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f\u06cc \u0645\u062f\u06cc\u0631\u06cc\u062a \u0645\u06cc \u06a9\u0646\u062f \u0648 \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u062c\u0627\u06cc\u06af\u0632\u06cc\u0646\u06cc \u0628\u0631\u0627\u06cc \u0622\u0646 \u0639\u0645\u0644 \u0645\u06cc \u06a9\u0646\u062f <code>useState<\/code>.<\/li>\n<li>\n<strong>\u0627\u0633\u062a\u0641\u0627\u062f\u0647<\/strong>:\n<\/li>\n<\/ul>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code>  <span class=\"k\">import<\/span> <span class=\"nx\">React<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useReducer<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\n\n  <span class=\"kd\">function<\/span> <span class=\"nf\">reducer<\/span><span class=\"p\">(<\/span><span class=\"nx\">state<\/span><span class=\"p\">,<\/span> <span class=\"nx\">action<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\n    <span class=\"k\">switch <\/span><span class=\"p\">(<\/span><span class=\"nx\">action<\/span><span class=\"p\">.<\/span><span class=\"nx\">type<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\n      <span class=\"k\">case<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">increment<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span>\n        <span class=\"k\">return<\/span> <span class=\"p\">{<\/span> <span class=\"na\">count<\/span><span class=\"p\">:<\/span> <span class=\"nx\">state<\/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=\"k\">case<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">decrement<\/span><span class=\"dl\">'<\/span><span class=\"p\">:<\/span>\n        <span class=\"k\">return<\/span> <span class=\"p\">{<\/span> <span class=\"na\">count<\/span><span class=\"p\">:<\/span> <span class=\"nx\">state<\/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=\"nl\">default<\/span><span class=\"p\">:<\/span>\n        <span class=\"k\">return<\/span> <span class=\"nx\">state<\/span><span class=\"p\">;<\/span>\n    <span class=\"p\">}<\/span>\n  <span class=\"p\">}<\/span>\n\n  <span class=\"kd\">function<\/span> <span class=\"nf\">Counter<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\n    <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">state<\/span><span class=\"p\">,<\/span> <span class=\"nx\">dispatch<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useReducer<\/span><span class=\"p\">(<\/span><span class=\"nx\">reducer<\/span><span class=\"p\">,<\/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    <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\n      <span class=\"o\"><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span>\n        <span class=\"o\"><span class=\"nx\">p<\/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\"><span class=\"sr\">\/p<\/span><span class=\"err\">&gt;\n<\/span>        <span class=\"o\"><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=\"nf\">dispatch<\/span><span class=\"p\">({<\/span> <span class=\"na\">type<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">increment<\/span><span class=\"dl\">'<\/span> <span class=\"p\">})}<\/span><span class=\"o\">&gt;+<span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\n<\/span>        <span class=\"o\"><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=\"nf\">dispatch<\/span><span class=\"p\">({<\/span> <span class=\"na\">type<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">decrement<\/span><span class=\"dl\">'<\/span> <span class=\"p\">})}<\/span><span class=\"o\">&gt;-<span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\n<\/span>      <span class=\"o\"><span class=\"sr\">\/div<\/span><span class=\"err\">&gt;\n<\/span>    <span class=\"p\">);<\/span>\n  <span class=\"p\">}<\/span>\n<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/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<ul>\n<li>\n<strong>\u062a\u0648\u0636\u06cc\u062d<\/strong>: <code>useReducer<\/code> \u0628\u0631\u0627\u06cc \u0645\u062f\u06cc\u0631\u06cc\u062a \u062d\u0627\u0644\u062a\u06cc \u06a9\u0647 \u0628\u0647 \u0645\u0646\u0637\u0642 \u067e\u06cc\u0686\u06cc\u062f\u0647 \u062a\u0631 \u06cc\u0627 \u0627\u0642\u062f\u0627\u0645\u0627\u062a \u0645\u062a\u0639\u062f\u062f \u0628\u0633\u062a\u06af\u06cc \u062f\u0627\u0631\u062f \u0645\u0641\u06cc\u062f \u0627\u0633\u062a. \u06cc\u06a9 \u062a\u0627\u0628\u0639 \u06a9\u0627\u0647\u0646\u062f\u0647 \u0648 \u06cc\u06a9 \u062d\u0627\u0644\u062a \u0627\u0648\u0644\u06cc\u0647 \u0645\u06cc \u06af\u06cc\u0631\u062f \u0648 \u062d\u0627\u0644\u062a \u0641\u0639\u0644\u06cc \u0648 a \u0631\u0627 \u0628\u0631\u0645\u06cc \u06af\u0631\u062f\u0627\u0646\u062f <code>dispatch<\/code> \u062a\u0627\u0628\u0639<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"5_useRef\"><\/span>\n<p>  5. <strong>useRef<\/strong><br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<strong>\u0647\u062f\u0641<\/strong>: \u0628\u0647 \u06cc\u06a9 \u0645\u0631\u062c\u0639 \u062a\u063a\u06cc\u06cc\u0631\u067e\u0630\u06cc\u0631 \u0628\u0647 \u06cc\u06a9 \u0639\u0646\u0635\u0631 \u06cc\u0627 \u0645\u0642\u062f\u0627\u0631 DOM \u06a9\u0647 \u062f\u0631 \u0633\u0631\u0627\u0633\u0631 \u0631\u0646\u062f\u0631\u0647\u0627 \u0628\u0627\u0642\u06cc \u0645\u06cc \u0645\u0627\u0646\u062f \u062f\u0633\u062a\u0631\u0633\u06cc \u067e\u06cc\u062f\u0627 \u0645\u06cc \u06a9\u0646\u062f \u0648 \u0630\u062e\u06cc\u0631\u0647 \u0645\u06cc \u06a9\u0646\u062f.<\/li>\n<li>\n<strong>\u0627\u0633\u062a\u0641\u0627\u062f\u0647<\/strong>:\n<\/li>\n<\/ul>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code>  <span class=\"k\">import<\/span> <span class=\"nx\">React<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useRef<\/span><span class=\"p\">,<\/span> <span class=\"nx\">useEffect<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\n\n  <span class=\"kd\">function<\/span> <span class=\"nf\">TextInputWithFocusButton<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\n    <span class=\"kd\">const<\/span> <span class=\"nx\">inputEl<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useRef<\/span><span class=\"p\">(<\/span><span class=\"kc\">null<\/span><span class=\"p\">);<\/span>\n\n    <span class=\"kd\">const<\/span> <span class=\"nx\">onButtonClick<\/span> <span class=\"o\">=<\/span> <span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n      <span class=\"nx\">inputEl<\/span><span class=\"p\">.<\/span><span class=\"nx\">current<\/span><span class=\"p\">.<\/span><span class=\"nf\">focus<\/span><span class=\"p\">();<\/span> <span class=\"c1\">\/\/ Access the DOM element directly<\/span>\n    <span class=\"p\">};<\/span>\n\n    <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\n      <span class=\"o\"\/>\n        <span class=\"o\"><span class=\"nx\">input<\/span> <span class=\"nx\">ref<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">inputEl<\/span><span class=\"p\">}<\/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=\"o\">\/&gt;<\/span>\n        <span class=\"o\"><span class=\"nx\">button<\/span> <span class=\"nx\">onClick<\/span><span class=\"o\">=<\/span><span class=\"p\">{<\/span><span class=\"nx\">onButtonClick<\/span><span class=\"p\">}<\/span><span class=\"o\">&gt;<\/span><span class=\"nx\">Focus<\/span> <span class=\"nx\">the<\/span> <span class=\"nx\">input<\/span><span class=\"o\"><span class=\"sr\">\/button<\/span><span class=\"err\">&gt;\n<\/span>      <span class=\"o\"><span class=\"sr\">\/<\/span><span class=\"err\">&gt;\n<\/span>    <span class=\"p\">);<\/span>\n  <span class=\"p\">}<\/span>\n<\/span><\/span><\/span><\/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<ul>\n<li>\n<strong>\u062a\u0648\u0636\u06cc\u062d<\/strong>: <code>useRef<\/code> \u06cc\u06a9 \u0634\u06cc\u0621 \u0642\u0627\u0628\u0644 \u062a\u063a\u06cc\u06cc\u0631 \u0631\u0627 \u0628\u0627 a \u0628\u0631\u0645\u06cc \u06af\u0631\u062f\u0627\u0646\u062f <code>.current<\/code> \u0648\u06cc\u0698\u06af\u06cc \u06a9\u0647 \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0645\u0642\u062f\u0627\u0631 \u06cc\u0627 \u0627\u0631\u062c\u0627\u0639 \u0628\u0647 \u0639\u0646\u0635\u0631 DOM \u0631\u0627 \u062f\u0631 \u062e\u0648\u062f \u062c\u0627\u06cc \u062f\u0647\u062f. \u0627\u06cc\u0646 \u0645\u0642\u062f\u0627\u0631 \u062f\u0631 \u062a\u0645\u0627\u0645 \u0631\u0646\u062f\u0631\u0647\u0627 \u0628\u062f\u0648\u0646 \u0627\u06cc\u062c\u0627\u062f \u0631\u0646\u062f\u0631\u0647\u0627\u06cc \u0645\u062c\u062f\u062f \u0647\u0646\u06af\u0627\u0645 \u0628\u0647\u200c\u0631\u0648\u0632\u0631\u0633\u0627\u0646\u06cc \u0628\u0627\u0642\u06cc \u0645\u06cc\u200c\u0645\u0627\u0646\u062f.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"6_useMemo_%D9%88_useCallback\"><\/span>\n<p>  6. <strong>useMemo \u0648 useCallback<\/strong><br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<strong>\u0647\u062f\u0641<\/strong>: \u0628\u0627 \u0628\u0647 \u062e\u0627\u0637\u0631 \u0633\u067e\u0631\u062f\u0646 \u0645\u062d\u0627\u0633\u0628\u0627\u062a \u06cc\u0627 \u062a\u0648\u0627\u0628\u0639 \u06af\u0631\u0627\u0646 \u0642\u06cc\u0645\u062a\u060c \u0639\u0645\u0644\u06a9\u0631\u062f \u0631\u0627 \u0628\u0647\u06cc\u0646\u0647 \u06a9\u0646\u06cc\u062f.<\/li>\n<li>\n<strong>\u0627\u0633\u062a\u0641\u0627\u062f\u0647<\/strong>:\n<\/li>\n<\/ul>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight javascript\"><code>  <span class=\"k\">import<\/span> <span class=\"nx\">React<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useMemo<\/span><span class=\"p\">,<\/span> <span class=\"nx\">useCallback<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\n\n  <span class=\"kd\">function<\/span> <span class=\"nf\">Example<\/span><span class=\"p\">({<\/span> <span class=\"nx\">items<\/span> <span class=\"p\">})<\/span> <span class=\"p\">{<\/span>\n    <span class=\"kd\">const<\/span> <span class=\"nx\">expensiveCalculation<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useMemo<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n      <span class=\"k\">return<\/span> <span class=\"nx\">items<\/span><span class=\"p\">.<\/span><span class=\"nf\">reduce<\/span><span class=\"p\">((<\/span><span class=\"nx\">a<\/span><span class=\"p\">,<\/span> <span class=\"nx\">b<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">a<\/span> <span class=\"o\">+<\/span> <span class=\"nx\">b<\/span><span class=\"p\">,<\/span> <span class=\"mi\">0<\/span><span class=\"p\">);<\/span>\n    <span class=\"p\">},<\/span> <span class=\"p\">[<\/span><span class=\"nx\">items<\/span><span class=\"p\">]);<\/span>\n\n    <span class=\"kd\">const<\/span> <span class=\"nx\">memoizedCallback<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useCallback<\/span><span class=\"p\">(()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\n      <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">This function is memoized<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\n    <span class=\"p\">},<\/span> <span class=\"p\">[]);<\/span>\n\n    <span class=\"k\">return<\/span> <span class=\"o\"><span class=\"nx\">div<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">{<\/span><span class=\"nx\">expensiveCalculation<\/span><span class=\"p\">}<\/span><span class=\"o\"><span class=\"sr\">\/div&gt;<\/span><span class=\"err\">;\n<\/span>  <span class=\"p\">}<\/span>\n<\/span><\/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<ul>\n<li>\n<strong>\u062a\u0648\u0636\u06cc\u062d<\/strong>: <code>useMemo<\/code> \u06cc\u06a9 \u0645\u0642\u062f\u0627\u0631 \u0645\u062d\u0627\u0633\u0628\u0647 \u0634\u062f\u0647 \u0631\u0627 \u0628\u0647 \u062e\u0627\u0637\u0631 \u0645\u06cc \u0633\u067e\u0627\u0631\u062f \u0648 \u062a\u0646\u0647\u0627 \u0632\u0645\u0627\u0646\u06cc \u0622\u0646 \u0631\u0627 \u062f\u0648\u0628\u0627\u0631\u0647 \u0645\u062d\u0627\u0633\u0628\u0647 \u0645\u06cc \u06a9\u0646\u062f \u06a9\u0647 \u0648\u0627\u0628\u0633\u062a\u06af\u06cc \u0647\u0627\u06cc \u0622\u0646 \u062a\u063a\u06cc\u06cc\u0631 \u06a9\u0646\u062f. <code>useCallback<\/code> \u06cc\u06a9 \u062a\u0627\u0628\u0639 \u0631\u0627 \u0628\u0647 \u062e\u0627\u0637\u0631 \u0645\u06cc\u200c\u0633\u067e\u0627\u0631\u062f \u0648 \u0627\u0637\u0645\u06cc\u0646\u0627\u0646 \u0645\u06cc\u200c\u062f\u0647\u062f \u06a9\u0647 \u062a\u0646\u0647\u0627 \u0632\u0645\u0627\u0646\u06cc \u06a9\u0647 \u0648\u0627\u0628\u0633\u062a\u06af\u06cc\u200c\u0647\u0627\u06cc \u0622\u0646 \u062a\u063a\u06cc\u06cc\u0631 \u0645\u06cc\u200c\u06a9\u0646\u062f\u060c \u062f\u0648\u0628\u0627\u0631\u0647 \u062a\u0639\u0631\u06cc\u0641 \u0645\u06cc\u200c\u0634\u0648\u062f.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"%DA%86%D8%B1%D8%A7_%D9%82%D9%84%D8%A7%D8%A8_%D9%87%D8%A7_%D9%85%D9%81%DB%8C%D8%AF_%D9%87%D8%B3%D8%AA%D9%86%D8%AF\"><\/span>\n<p>  \u0686\u0631\u0627 \u0642\u0644\u0627\u0628 \u0647\u0627 \u0645\u0641\u06cc\u062f \u0647\u0633\u062a\u0646\u062f<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<strong>\u06a9\u062f \u067e\u0627\u06a9 \u06a9\u0646\u0646\u062f\u0647<\/strong>: \u0642\u0644\u0627\u0628 \u0647\u0627 \u0628\u0647 \u0634\u0645\u0627 \u0627\u0645\u06a9\u0627\u0646 \u0645\u06cc \u062f\u0647\u0646\u062f \u0628\u062f\u0648\u0646 \u0646\u06cc\u0627\u0632 \u0628\u0647 \u0627\u062c\u0632\u0627\u06cc \u06a9\u0644\u0627\u0633\u060c \u06a9\u062f\u0647\u0627\u06cc \u062a\u0645\u06cc\u0632\u062a\u0631 \u0648 \u062e\u0648\u0627\u0646\u0627\u062a\u0631 \u0628\u0646\u0648\u06cc\u0633\u06cc\u062f.<\/li>\n<li>\n<strong>\u0642\u0627\u0628\u0644\u06cc\u062a \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u062c\u062f\u062f<\/strong>: \u0642\u0644\u0627\u0628 \u0647\u0627 \u0631\u0627 \u0645\u06cc \u062a\u0648\u0627\u0646 \u0645\u062c\u062f\u062f\u0627\u064b \u062f\u0631 \u0627\u062c\u0632\u0627\u06cc \u0645\u062e\u062a\u0644\u0641 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0631\u062f \u06cc\u0627 \u062d\u062a\u06cc \u0628\u06cc\u0646 \u067e\u0631\u0648\u0698\u0647 \u0647\u0627 \u0628\u0647 \u0627\u0634\u062a\u0631\u0627\u06a9 \u06af\u0630\u0627\u0634\u062a.<\/li>\n<li>\n<strong>\u0645\u0646\u0637\u0642 \u062d\u0627\u0644\u062a \u062f\u0631 \u0645\u0648\u0644\u0641\u0647 \u0647\u0627\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f\u06cc<\/strong>: \u0642\u0644\u0627\u0628 \u0647\u0627 \u0634\u0645\u0627 \u0631\u0627 \u0642\u0627\u062f\u0631 \u0645\u06cc \u0633\u0627\u0632\u0646\u062f \u062a\u0627 \u062d\u0627\u0644\u062a \u0648 \u0639\u0648\u0627\u0631\u0636 \u062c\u0627\u0646\u0628\u06cc \u0631\u0627 \u062f\u0631 \u0627\u062c\u0632\u0627\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f\u06cc \u0645\u062f\u06cc\u0631\u06cc\u062a \u06a9\u0646\u06cc\u062f \u0648 \u0622\u0646\u0647\u0627 \u0631\u0627 \u0628\u0647 \u0627\u0646\u062f\u0627\u0632\u0647 \u0627\u062c\u0632\u0627\u06cc \u06a9\u0644\u0627\u0633 \u0642\u062f\u0631\u062a\u0645\u0646\u062f \u0645\u06cc \u06a9\u0646\u062f.<\/li>\n<\/ul>\n<p>\u0647\u0648\u06a9\u200c\u0647\u0627 \u0631\u0648\u0634\u06cc \u0631\u0627 \u06a9\u0647 \u062a\u0648\u0633\u0639\u0647\u200c\u062f\u0647\u0646\u062f\u06af\u0627\u0646 \u0628\u0631\u0646\u0627\u0645\u0647\u200c\u0647\u0627\u06cc React \u0645\u06cc\u200c\u0646\u0648\u06cc\u0633\u0646\u062f \u062a\u063a\u06cc\u06cc\u0631 \u062f\u0627\u062f\u0647\u200c\u0627\u0646\u062f\u060c \u0648 \u0645\u0624\u0644\u0641\u0647\u200c\u0647\u0627\u06cc \u06a9\u0627\u0631\u0628\u0631\u062f\u06cc \u0631\u0627 \u0642\u0627\u0628\u0644\u06cc\u062a\u200c\u062a\u0631 \u0648 \u0645\u062f\u06cc\u0631\u06cc\u062a \u0622\u0633\u0627\u0646\u200c\u062a\u0631 \u06a9\u0631\u062f\u0647\u200c\u0627\u0646\u062f.<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Summarize this content to 400 words in Persian Lang React Hook \u0647\u0627 \u062a\u0648\u0627\u0628\u0639\u06cc \u0647\u0633\u062a\u0646\u062f \u06a9\u0647 \u0628\u0647 \u0634\u0645\u0627 \u0627\u0645\u06a9\u0627\u0646 \u0645\u06cc \u062f\u0647\u0646\u062f \u0627\u0632 \u062d\u0627\u0644\u062a \u0648 \u0633\u0627\u06cc\u0631 \u0648\u06cc\u0698\u06af\u06cc \u0647\u0627\u06cc React \u062f\u0631 \u06a9\u0627\u0645\u067e\u0648\u0646\u0646\u062a \u0647\u0627\u06cc \u062a\u0627\u0628\u0639\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f\u060c \u06a9\u0647 \u0628\u0647 \u0637\u0648\u0631 \u0633\u0646\u062a\u06cc \u0641\u0642\u0637 \u062f\u0631 \u0645\u0624\u0644\u0641\u0647 \u0647\u0627\u06cc \u06a9\u0644\u0627\u0633 \u0645\u0648\u062c\u0648\u062f \u0628\u0648\u062f\u0646\u062f. \u0622\u0646\u0647\u0627 \u062f\u0631 React 16.8 \u0645\u0639\u0631\u0641\u06cc \u0634\u062f\u0646\u062f \u0648 \u0627\u0632 \u0622\u0646 \u0632\u0645\u0627\u0646 \u0628\u0647 &hellip;<\/p>\n","protected":false},"author":2,"featured_media":74989,"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-74988","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\/74988","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=74988"}],"version-history":[{"count":0,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts\/74988\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media\/74989"}],"wp:attachment":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media?parent=74988"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/categories?post=74988"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/tags?post=74988"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}