how map in js works with example - javascript map with MDN example - Java Script Errs

Here's the brief example of how map works with JS (Java Script) by MDN.

  The map() method creates a new array with the results of calling a provided function on every element in the calling array.

Code Ex:

//Example Array

var array1 = [1, 7, 9, 16];

// pass a function to map

const map1 = array1.map(x => x * 2);

console.log(map1);

// expected output: Array [2, 14, 18, 32]

var new_array = arr.map(function callback(currentValue[, index[, array]]) {
    // Return element for new_array
}[, thisArg])

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