The simplest array creation in JavaScript?

Question

JavaScript

The situation after PHP in the field of creating an array became rather incomprehensible.
Previously, I could apply to an example in a loop:
arr[number] = response;
Where, number - will be any number, for example 1000 or 1350.
How to create such an array in JavaScript?
For example:

var images = []; 
images[number] = response;

If number is 20, it doesn't create it and the array is left empty. In this case, number can be 130, etc.

Answer 1

Use objects instead of arrays.

var images = {};
images[number] = response;

Answer 2

https://learn.javascript.ru/data-structures
Probably the best tutorial I've ever seen, find about arrays, everything is super clear

Answer 3

What's the problem?

var images = []; // []
images[130] = "hello, world"; // [undefined x 130, "hello, world"]