make-array.js

/*
 * Pre-ECMAScript 1, JavaScript didn't have native arrays.
 * Those who needed them frequently used functions such as the following.
 * Also note that there was no special "undefined" value.
 */

function makeArray(len){

    var array = new Object();
    
    array.length = len;

    //initialize each item with null (empty placeholder)
    for (var i=0; i < len; i++){
        array[i] = null;
    }

    return array;

}


var colors = makeArray(4);
colors[0] = "red";
colors[1] = "blue";
colors[2] = "green";
colors[3] = "black";

Nicholas, thank you for this! Just started coding in JavaScript and this piece of code really helped me solve my problem I was having with creating multiple arrays with a function.

It is 2023, you can write colors this way now:

let colors = ["red", "blue", "green", "black"]