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Why shouldn’t JavaScript functions not be too long?

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Why shouldn’t JavaScript functions not be too long?

(a) User friendliness

(b) Tie up event loops

(c) Browser becomes unresponsive

(d) All of the mentioned

I got this question in final exam.

The above asked question is from Web Workers topic in chapter Caching, Debugging and Animation of JavaScript

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Right option is (d) All of the mentioned

Easy explanation: When JavaScript code runs for longer than a predefined amount of time than the browser shows a message of unresponsive script. The client-side JavaScript functions must not run too long: otherwise, they will tie up the event loop and the web browser will become unresponsive to user input.

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