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Function reusable piece of code या block of code होता है जो कि कोई specific task perform करता है। एक बार define करने के बाद हम इन्हें script में कितनी ही बार use / call कर सकते हैं। इसके अलावा JavaScript में 1000+ predefined useful function हैं जिन्हें हम Built In Functions कहते हैं। JavaScript में function एक object है।

हालाँकि JavaScript हमें ये facility provide करती है कि user खुद के function define कर सके जिन्हें User Defines Functions कहते हैं । Web page load होते समय कोई भी function automatically run नहीं होता है जब तक कि हम उसे किसी event handler की help से या manually call / invoke न करें।

Important *

JavaScript में Function Objects होते हैं , new keyword के through आप function Object (Arrow Function को छोड़कर) बना सकते हैं। इसलिए functions को आप किसी variable में assign भी कर सकते है , और किसी function में as an argument pass भी कर सकते हैं। ( जिन्हे Callback Function कहते हैं )

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