javascript create empty array of a given size

Question

in javascript how would I create an empty array of a given size

Psuedo code:

X = 3;
createarray(myarray, X, \"\");

output:

Answer 1

We use Array.from({length: 500}) since 2017.

Answer 2

Try using while loop, Array.prototype.push()

var myArray = [], X = 3;
while (myArray.length < X) {
  myArray.push("")
}

Alternatively, using Array.prototype.fill()

var myArray = Array(3).fill("");

Answer 3

If you want to create anonymous array with some values so you can use this syntax.

var arr = new Array(50).fill().map((d,i)=>++i)
console.log(arr)

Answer 4

In 2018 and thenceforth we shall use [...Array(500)] to that end.

Answer 5

As of ES5 (when this answer was given):

If you want an empty array of undefined elements, you could simply do

var whatever = new Array(5);

this would give you

[undefined, undefined, undefined, undefined, undefined]

and then if you wanted it to be filled with empty strings, you could do

whatever.fill('');

which would give you

["", "", "", "", ""]

And if you want to do it in one line:

var whatever = Array(5).fill('');

Answer 6

var arr = new Array(5);
console.log(arr.length) // 5