javascript iterate array map code example

Example 1: use map to loop through an array

let squares = [1,2,3,4].map(function (val) {  
    return val * val;  
}); 
// squares will be equal to [1, 4, 9, 16]

Example 2: javascript map over new array

// With ES6, you can do this:

[...Array(10)].map((a, b) => a)