Moving to Arrow Functions

Progressing from the old way of looping through an array toward arrow functions.

Old way

var nums = [1, 2, 3, 4, 5, 6],
    dblNums = [];

for (var i = 0, len = nums.length; i < len; i++) {
  dblNums[i] = nums[i] * 2;
}

Using the map function¹

var nums = [1, 2, 3, 4, 5, 6],
    dblNums = nums.map(function(n) {
      return n * 2;
    });

Using an arrow function² in the map function

var nums = [1, 2, 3, 4, 5, 6],
    dblNums = nums.map(n => n * 2);

Written on July 20, 2016