Most Important JavaScript Array Method.
map() Array Method:
Creates a new array from calling a function for every array element. Does not execute the function for empty elements.(ES5)
filter() Array Method:
Method creates a new array filled with elements that pass a test provided by a funciton. Does not execute the function for empty elements.
reduce() Array Method:
Returns a single value: The function's accumulated result. Does not execute the function for empty array elements.
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