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Callback in Javascript

In JavaScript, functions are objects. Because of this, functions can take functions as arguments and can be returned by other functions. Functions that do this are called higher-order functions. Any function that is passed as an argument is…

Pure Functions In Javascript

Pure functions in Javascript are kind of Functions where the return value is determined by its parameter passed at call time. Javascript is not a purely functional language; it treats functions as objects (first-class functions). If you…