Thursday, 10 August, 2017 UTC


Summary

map() method helps you to create a new array by calling a function on each element of the Array. This function is a custom function which can be used in order to manipulate data within an array and get a new resultant array.
A simple implementation of map() over an Array. Let’s find the square of all the possible numbers in an array.
ES5 Implementation
var numbers = [3,4,22,533,6,52,1,34,454,2,435,456];

var numberSquareES5 = numbers.map(function(number){
  return number*number;
});
console.log(numberSquareES5)
ES6 Implementation
var numbers = [3,4,22,533,6,52,1,34,454,2,435,456];

var numberSquareES6 = numbers.map(number=>number*number);
console.log(numberSquareES6)
This can be seen in action out here below.
Check out all the other posts on JavaScript Essentials to get a Grasp of these JavaScript Utilities.
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