{"id":102859,"date":"2025-03-23T23:23:39","date_gmt":"2025-03-23T18:53:39","guid":{"rendered":"https:\/\/nabfollower.com\/blog\/%d8%b3%d8%b1%db%8c-%d8%b7%d8%b1%d8%a7%d8%ad%db%8c-%d8%b3%db%8c%d8%b3%d8%aa%d9%85-%d8%b1%d9%88%d8%b2-2-%d8%a7%d9%84%da%af%d9%88%d9%87%d8%a7%db%8c-%d8%b7%d8%b1%d8%a7%d8%ad%db%8c-observer\/"},"modified":"2025-03-23T23:23:39","modified_gmt":"2025-03-23T18:53:39","slug":"%d8%b3%d8%b1%db%8c-%d8%b7%d8%b1%d8%a7%d8%ad%db%8c-%d8%b3%db%8c%d8%b3%d8%aa%d9%85-%d8%b1%d9%88%d8%b2-2-%d8%a7%d9%84%da%af%d9%88%d9%87%d8%a7%db%8c-%d8%b7%d8%b1%d8%a7%d8%ad%db%8c-observer","status":"publish","type":"post","link":"https:\/\/nabfollower.com\/blog\/%d8%b3%d8%b1%db%8c-%d8%b7%d8%b1%d8%a7%d8%ad%db%8c-%d8%b3%db%8c%d8%b3%d8%aa%d9%85-%d8%b1%d9%88%d8%b2-2-%d8%a7%d9%84%da%af%d9%88%d9%87%d8%a7%db%8c-%d8%b7%d8%b1%d8%a7%d8%ad%db%8c-observer\/","title":{"rendered":"\u0633\u0631\u06cc \u0637\u0631\u0627\u062d\u06cc \u0633\u06cc\u0633\u062a\u0645 – \u0631\u0648\u0632 2: \u0627\u0644\u06af\u0648\u0647\u0627\u06cc \u0637\u0631\u0627\u062d\u06cc Observer"},"content":{"rendered":"
\n

\u0628\u0647 \u0631\u0648\u0632 2 \u0633\u0631\u06cc \u06cc\u0627\u062f\u06af\u06cc\u0631\u06cc \u0637\u0631\u0627\u062d\u06cc \u0633\u06cc\u0633\u062a\u0645 \u0645\u0646 \u062e\u0648\u0634 \u0622\u0645\u062f\u06cc\u062f! \u0627\u0645\u0631\u0648\u0632 \u060c \u0628\u06cc\u0627\u06cc\u06cc\u062f \u0628\u0647 \u0627\u0644\u06af\u0648\u0647\u0627\u06cc \u0637\u0631\u0627\u062d\u06cc \u060c \u0627\u0644\u06af\u0648\u06cc Observer \u0634\u06cc\u0631\u062c\u0647 \u0628\u0632\u0646\u06cc\u0645.
\ud83d\udccc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0645\u0648\u0631\u062f: \u0631\u0648\u0634 \u0647\u0627\u06cc \u067e\u0631\u062f\u0627\u062e\u062a \u062f\u0631 \u062a\u062c\u0627\u0631\u062a \u0627\u0644\u06a9\u062a\u0631\u0648\u0646\u06cc\u06a9\u06cc (\u06a9\u0627\u0631\u062a \u0627\u0639\u062a\u0628\u0627\u0631\u06cc \u060c \u067e\u06cc \u067e\u0627\u0644 \u060c UPI).
\ud83d\udd39 \u0627\u0644\u06af\u0648\u06cc \u0637\u0631\u0627\u062d\u06cc Observer (\u0646\u0645\u0627\u06cc \u06a9\u0644\u06cc)
\u0627\u0644\u06af\u0648\u06cc Observer \u06cc\u06a9 \u0648\u0627\u0628\u0633\u062a\u06af\u06cc \u06cc\u06a9 \u0628\u0647 \u06cc\u06a9 \u0628\u0647 \u0628\u0633\u06cc\u0627\u0631\u06cc \u0627\u0632 \u0627\u0634\u06cc\u0627\u0621 \u0631\u0627 \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc \u06a9\u0646\u062f \u060c \u0628\u0646\u0627\u0628\u0631\u0627\u06cc\u0646 \u0648\u0642\u062a\u06cc \u06cc\u06a9 \u0634\u06cc (\u0642\u0627\u0628\u0644 \u0645\u0634\u0627\u0647\u062f\u0647) \u062a\u063a\u06cc\u06cc\u0631 \u0645\u06cc \u06a9\u0646\u062f \u060c \u0628\u0647 \u0647\u0645\u0647 \u0627\u0634\u06cc\u0627\u0621 \u0648\u0627\u0628\u0633\u062a\u0647 (\u0646\u0627\u0638\u0631\u0627\u0646) \u0627\u0637\u0644\u0627\u0639 \u062f\u0627\u062f\u0647 \u0645\u06cc \u0634\u0648\u062f.
\ud83d\udccc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0645\u0648\u0631\u062f: \u0633\u06cc\u0633\u062a\u0645 \u0647\u0627\u06cc \u0627\u0639\u0644\u0627\u0646 \u060c \u0634\u0646\u0648\u0646\u062f\u06af\u0627\u0646 \u0631\u0648\u06cc\u062f\u0627\u062f \u060c \u0628\u0647 \u0631\u0648\u0632\u0631\u0633\u0627\u0646\u06cc \u0642\u06cc\u0645\u062a \u0633\u0647\u0627\u0645.
\ud83d\udd0d \u0634\u06cc\u0631\u062c\u0647 \u0639\u0645\u06cc\u0642: \u0627\u0644\u06af\u0648\u06cc \u0646\u0627\u0638\u0631 – \u0633\u0648\u0627\u0644 \u0645\u0635\u0627\u062d\u0628\u0647 Walmart SDE
\u2753 \u0627\u062c\u0631\u0627\u06cc \u06cc\u06a9 \u062a\u0627\u0628\u0639 Notify \u0628\u0631\u0627\u06cc \u0627\u0637\u0644\u0627\u0639 \u0627\u0632 \u0647\u0645\u0647 \u0645\u0634\u062a\u0631\u06a9\u06cc\u0646 \u062f\u0631 \u0647\u0646\u06af\u0627\u0645 \u0648\u0642\u0648\u0639 \u06cc\u06a9 \u0631\u0648\u06cc\u062f\u0627\u062f.
\ud83d\udca1 \u0631\u0627\u0647 \u062d\u0644:
1\u20e3 \u06cc\u06a9 \u0645\u0634\u0627\u0647\u062f\u0647 \u06a9\u0646\u0646\u062f\u0647 (\u0646\u0627\u0634\u0631) \u0631\u0627 \u062a\u0639\u0631\u06cc\u0641 \u06a9\u0646\u06cc\u062f \u06a9\u0647 \u0644\u06cc\u0633\u062a\u06cc \u0627\u0632 \u0646\u0627\u0638\u0631\u0627\u0646 \u0631\u0627 \u062d\u0641\u0638 \u0645\u06cc \u06a9\u0646\u062f.
2\u20e3 \u0627\u062c\u0631\u0627\u06cc \u0631\u0648\u0634 \u0647\u0627\u06cc \u0636\u0645\u06cc\u0645\u0647 \u060c \u062c\u062f\u0627 \u06a9\u0631\u062f\u0646 \u0648 \u0627\u0637\u0644\u0627\u0639 \u0631\u0633\u0627\u0646\u06cc.
3\u20e3 \u0645\u062d\u0635\u0648\u0644 \u0642\u0627\u0628\u0644 \u0645\u0634\u0627\u0647\u062f\u0647 \u0627\u0633\u062a: \u0647\u0631 \u0632\u0645\u0627\u0646 \u06a9\u0647 \u0648\u06cc\u0698\u06af\u06cc \u0647\u0627\u06cc \u0645\u062d\u0635\u0648\u0644 \u062a\u063a\u06cc\u06cc\u0631 \u0645\u06cc \u06a9\u0646\u062f \u060c \u0647\u0645\u0647 \u0646\u0627\u0638\u0631\u0627\u0646 \u0628\u0647 \u0631\u0648\u0632 \u0645\u06cc \u0634\u0648\u0646\u062f.
4\u20e3 \u0646\u0627\u0638\u0631\u0627\u0646 (\u0645\u0634\u062a\u0631\u06a9\u0627\u0646) \u0647\u0646\u06af\u0627\u0645 \u0627\u0637\u0644\u0627\u0639 \u0631\u0633\u0627\u0646\u06cc \u0648\u0627\u06a9\u0646\u0634 \u0646\u0634\u0627\u0646 \u0645\u06cc \u062f\u0647\u0646\u062f.<\/p>\n

\u062f\u0631 \u0627\u06cc\u0646\u062c\u0627 \u0627\u062c\u0631\u0627\u06cc \u0627\u0644\u06af\u0648\u06cc Observer \u0628\u0631\u0627\u06cc \u0645\u0634\u06a9\u0644 \u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 JavaScript \u0622\u0648\u0631\u062f\u0647 \u0634\u062f\u0647 \u0627\u0633\u062a:<\/p>\n

\n
class Observable {\n constructor() { \n this.observers = []; \/\/maintaining list of observer\n }\n\n attach(observer) {\n this.observers.push(observer); \/\/adding new observer\n }\n\n detach(observer) {\n this.observers = this.observers.filter(obs => obs !== observer); \n \/\/removing an observer in case of unsubscribing from notification service\n }\n\n notify(data) {\n this.observers.forEach(observer => observer.update(data));\n }\n}\n\nclass Product extends Observable {\n constructor(name, price) {\n super();\n this._name = name;\n this._price = price;\n }\n\n\/\/ calling notify() whenever product value changes\n set name(newName) {\n this._name = newName;\n this.notify(`Product name updated to: ${newName}`);\n }\n\n set price(newPrice) {\n this._price = newPrice;\n this.notify(`Price updated to: $${newPrice}`);\n }\n}\n\n\n\/\/ creating an observer class to identify each observer\nclass Observer {\n constructor(name) {\n this.name = name;\n }\n\n update(message) {\n console.log(`${this.name} received update: ${message}`);\n }\n}\n\n\/\/ Usage Example:\nconst product = new Product(\"Laptop\", 1000);\n\nconst observer1 = new Observer(\"Observer 1\");\nconst observer2 = new Observer(\"Observer 2\");\n\nproduct.attach(observer1);\nproduct.attach(observer2);\n\nproduct.price = 1200; \/\/ Notifies observers\nproduct.name = \"Gaming Laptop\"; \/\/ Notifies observers\n\nobservable.notify(\"New Event Occurred!\"); \/\/ Both observers get notified\n<\/code><\/pre>\n
\n
\n    \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    \n<\/svg><\/p>\n
    \u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    \n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n
\u0645\u062d\u0635\u0648\u0644 const = \u0645\u062d\u0635\u0648\u0644 \u062c\u062f\u06cc\u062f (“\u0644\u067e \u062a\u0627\u067e” \u060c 1000) \u061b<\/p>\n
const Observer1 = Observer \u062c\u062f\u06cc\u062f (“Observer 1”) \u061b
const Observer2 = New Observer (“Observer 2”) \u061b<\/p>\n
Product.Attach (Observer1) \u061b
Product.Attach (Observer2) \u061b<\/p>\n
Product.Price = 1200 \u061b \/\/ \u0628\u0647 \u0646\u0627\u0638\u0631\u0627\u0646 \u0627\u0637\u0644\u0627\u0639 \u0645\u06cc \u062f\u0647\u062f
product.name = “\u0644\u067e \u062a\u0627\u067e \u0628\u0627\u0632\u06cc” \u061b \/\/ \u0628\u0647 \u0646\u0627\u0638\u0631\u0627\u0646 \u0627\u0637\u0644\u0627\u0639 \u0645\u06cc \u062f\u0647\u062f<\/p>\n
Observable.Notify (“\u0631\u0648\u06cc\u062f\u0627\u062f \u062c\u062f\u06cc\u062f \u0631\u062e \u062f\u0627\u062f\u0647 \u0627\u0633\u062a!”) \u061b \/\/ \u0647\u0631 \u062f\u0648 \u0646\u0627\u0638\u0631\u0627\u0646 \u0645\u0637\u0644\u0639 \u0645\u06cc \u0634\u0648\u0646\u062f<\/p>\n
\ud83c\udf1f \u063a\u0630\u0627\u06cc \u0627\u0635\u0644\u06cc
\u2705 \u062c\u0641\u062a \u0634\u0644: \u0646\u0627\u0638\u0631\u0627\u0646 \u0648 \u0646\u0627\u0638\u0631\u0627\u0646 \u0628\u0627 \u062d\u062f\u0627\u0642\u0644 \u0648\u0627\u0628\u0633\u062a\u06af\u06cc \u062f\u0631 \u062a\u0639\u0627\u0645\u0644 \u0647\u0633\u062a\u0646\u062f.
\u2705 \u0627\u0646\u0639\u0637\u0627\u0641 \u067e\u0630\u06cc\u0631\u06cc: \u0646\u0627\u0638\u0631\u0627\u0646 \u062c\u062f\u06cc\u062f \u0631\u0627 \u0645\u06cc \u062a\u0648\u0627\u0646 \u0628\u0647 \u0635\u0648\u0631\u062a \u067e\u0648\u06cc\u0627 \u0627\u0636\u0627\u0641\u0647 \u0648 \u062d\u0630\u0641 \u06a9\u0631\u062f.
cases \u0645\u0648\u0627\u0631\u062f \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u062f\u0631 \u062f\u0646\u06cc\u0627\u06cc \u0648\u0627\u0642\u0639\u06cc: \u062e\u062f\u0645\u0627\u062a \u0627\u0637\u0644\u0627\u0639 \u0631\u0633\u0627\u0646\u06cc \u060c \u0628\u0647 \u0631\u0648\u0632\u0631\u0633\u0627\u0646\u06cc \u0628\u0627\u0632\u0627\u0631 \u0633\u0647\u0627\u0645 \u060c \u0633\u06cc\u0633\u062a\u0645 \u0647\u0627\u06cc \u0645\u062d\u0648\u0631 \u0631\u0648\u06cc\u062f\u0627\u062f.
\u0634\u0645\u0627 \u062f\u0631 \u0645\u0648\u0631\u062f \u0627\u0644\u06af\u0648\u06cc Observer \u0686\u06cc\u0633\u062a\u061f \u0622\u06cc\u0627 \u062f\u0631 \u0633\u0646\u0627\u0631\u06cc\u0648\u0647\u0627\u06cc \u062f\u0646\u06cc\u0627\u06cc \u0648\u0627\u0642\u0639\u06cc \u0628\u0627 \u0622\u0646 \u0631\u0648\u0628\u0631\u0648 \u0634\u062f\u0647 \u0627\u06cc\u062f\u061f \u0628\u06cc\u0627\u06cc\u06cc\u062f \u062f\u0631 \u0646\u0638\u0631\u0627\u062a \u0628\u062d\u062b \u06a9\u0646\u06cc\u0645! \ud83d\ude80<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"
\u0628\u0647 \u0631\u0648\u0632 2 \u0633\u0631\u06cc \u06cc\u0627\u062f\u06af\u06cc\u0631\u06cc \u0637\u0631\u0627\u062d\u06cc \u0633\u06cc\u0633\u062a\u0645 \u0645\u0646 \u062e\u0648\u0634 \u0622\u0645\u062f\u06cc\u062f! \u0627\u0645\u0631\u0648\u0632 \u060c \u0628\u06cc\u0627\u06cc\u06cc\u062f \u0628\u0647 \u0627\u0644\u06af\u0648\u0647\u0627\u06cc \u0637\u0631\u0627\u062d\u06cc \u060c \u0627\u0644\u06af\u0648\u06cc Observer \u0634\u06cc\u0631\u062c\u0647 \u0628\u0632\u0646\u06cc\u0645.\ud83d\udccc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0645\u0648\u0631\u062f: \u0631\u0648\u0634 \u0647\u0627\u06cc \u067e\u0631\u062f\u0627\u062e\u062a \u062f\u0631 \u062a\u062c\u0627\u0631\u062a \u0627\u0644\u06a9\u062a\u0631\u0648\u0646\u06cc\u06a9\u06cc (\u06a9\u0627\u0631\u062a \u0627\u0639\u062a\u0628\u0627\u0631\u06cc \u060c \u067e\u06cc \u067e\u0627\u0644 \u060c UPI).\ud83d\udd39 \u0627\u0644\u06af\u0648\u06cc \u0637\u0631\u0627\u062d\u06cc Observer (\u0646\u0645\u0627\u06cc \u06a9\u0644\u06cc)\u0627\u0644\u06af\u0648\u06cc Observer \u06cc\u06a9 \u0648\u0627\u0628\u0633\u062a\u06af\u06cc \u06cc\u06a9 \u0628\u0647 \u06cc\u06a9 \u0628\u0647 \u0628\u0633\u06cc\u0627\u0631\u06cc \u0627\u0632 \u0627\u0634\u06cc\u0627\u0621 \u0631\u0627 \u0627\u06cc\u062c\u0627\u062f \u0645\u06cc …<\/p>\n","protected":false},"author":2,"featured_media":102860,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/media2.dev.to\/dynamic\/image\/width=1000,height=500,fit=cover,gravity=auto,format=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fp36hiq4p8aeqmmz2d59e.png","fifu_image_alt":"","footnotes":""},"categories":[339],"tags":[],"class_list":["post-102859","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\/102859","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=102859"}],"version-history":[{"count":0,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts\/102859\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media\/102860"}],"wp:attachment":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media?parent=102859"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/categories?post=102859"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/tags?post=102859"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}