JSFiddle - React, Tailwind, and code Playground

by Graham Fairweather

JavaScript

var array = [],
    length,
    undef,
    i;
    
array[1] = "a";
array[30] = "b";
array[50] = "c";

length = array.length;
for (i = 0; i < length; i += 1) {
    if (Object.prototype.hasOwnProperty.call(array, i)) {
        console.log(i, array[i]);
    }
}