It is an optional argument that is passed to the function and used as its "this" value.
arr: This is the array that the method was called upon. index: Indicates the index of the current element being processed. currentValue: This indicates the current element in the array being processed. The testFunc() is a function that is used to execute a condition on each element of the array until the function returns true, indicating that the element satisfying the condition was found. Syntax: array.forEach(testfunc(currentValue, index, arr), thisValue)Īrray.map(testfunc(currentValue, index, arr), thisValue)īoth the methods take two arguments: 1) testFunc Also, map() does not execute/call the function for those array elements without values. Hence map() method relies on immutability. But unlike the forEach() method, it creates a new array with the results of calling a function for every array element. 
The map() method, similar to the forEach() method, executes the provided function once for each element in an array. Also, forEach method doesn’t return anything (undefined).
After executing the function for every array element, this method changes the values of the existing array elements according to the result of the provided function. The forEach() method executes a provided function once for each element in an array.
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