#javascript #js #webdevelopment #programming #coding . Related Videos : JS Functions : https://youtu.be/6rGcdxXbKeo . .

About Callback Functions :

JavaScript में callback functions , normal function से थोड़े different होते हैं , आज इस blog में उसी के बारे में अच्छे से समझेंगे कि , actually में callback function कैसे work करते हैं।

Callback Functions वो function होते हैं जो किसी दूसरे function में as an arguments pass किये जाते हैं। और जिस function में ये pass किये जाते हैं उन्हें Higher - Order Function कहते हैं।

Need Of Callback Function In JS :

हम जानते हैं कि JavaScript Synchronous Scripting language है , means code Top -Down order में run होता है। But कई cases में code Asynchronously भी run होता है।

Actually जब हम setTimeOut() या await() function का use करके Asynchronously Code run करते हैं , तो वो code of block run होने से पहले ही उससे आगे का Code execute होने लगता है। जिसकी वजह से program में कभी-कभी errors भी आ जाती हैं या logic के according code run नहीं होता है।

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