Date: 2010jul19 Updated: 2017jun8 Language: javaScript Level: beginner Keywords: loop Q. How to I enumerate everything in a javaScript array? A. If it is NOT an associative array use a for-loop like this:

const a = [ 'apple', 'ibm', 'microsoft' ];

I prefer this way:

for (let i in a) { let element = a[i]; // Do something with element }

This works because a is actually:

const a = { 0: 'apple', 1: 'ibm', 2: 'microsoft' };

The conventional way:

for (let i = 0; i < a.length; i++) { let element = a[i]; // Do something with element }

ECMASscript 2015 introduced "of" which is nice, but can't be relied on:

for (let element of a) { // Do something with element }