js generate array from 1 to n code example

Example 1: js array of 1 to n

[...Array(10).keys()]

Example 2: javascript create array from 1 to n

// Javascript create array from 1 to n 

[...Array(n+1).keys()].slice(1)

// E.g. for n = 10:
// [...Array(11).keys()].slice(1)
// => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Example 3: create array with number js

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