JSFiddle - React, Tailwind, and code Playground

by f0t0n

JavaScript

var arrayCollection = [],
    objectCollection = {};

arrayCollection[999] = 1;
objectCollection[999] = 1;

var i = 0,
    l = arrayCollection.length;

for(; i < l; i++) {
    if(arrayCollection[i] == 1) {
        alert('Count of iterations for array: ' + i);
    }
}

i  = 0;

for(var prop in objectCollection) {
    i++;
    if(objectCollection[prop] == 1) {
        alert('Count of iterations for object: ' + i);
    }
}