For each array element, map() creates a new array by invoking a function. For each element in an array, map() calls a function once. For empty elements, map() does not run the function. The initial array is not changed by map().
This built-in function that lets you process and transform all the elements in an iterable without having to use an explicit for loop, a method known as mapping. When you need to apply a transformation function to each item in an iterable and change it into a new iterable, map() comes in handy.
A Set is a dataset that must be made up of unique values, however a Map is when you have pairings of related data and we map the keys to the values.
By individually converting each element in an array, map creates a new array. By deleting elements that don't belong, filter builds a new array. reduce, on the other hand, condenses all of the elements in an array into a single value.
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