array(5).fill().map((x i)= i) code example

Example 1: es6 create array with increasing number

Array.from(Array(10).keys())
//=> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

Example 2: create array with number js

var foo = new Array(45); // create an empty array with length 45