Iterate array with map prototypeArray.prototype.map() - Cacher Snippet

8/17/2017 - 10:59 AM

Iterate array with map prototype Array.prototype.map()

Iterate array with map prototype Array.prototype.map()

ArrayPrototypeMap.js

var numbers = [1, 5, 10, 15];
var doubles = numbers.map(function(x) {
   return x * 2;
});
// doubles is now [2, 10, 20, 30]
// numbers is still [1, 5, 10, 15]

var numbers = [1, 4, 9];
var roots = numbers.map(Math.sqrt);
// roots is now [1, 2, 3]
// numbers is still [1, 4, 9]