How to insert a variable into the first element of an associative array?

Question

JavaScript

Hello!
I can hardly understand why this problem occurs, and even more so how to solve it, but the point is that when I try to insert a variable into the first element of the array:

var id = 'test', num = 141241, num2 = 12424
var arr = {id : num, 'str' : num2}

It turns out this:
Object {id: 141241, str: 12424}
Why does js see the id variable as a string? And how do you put it in there?
Thanks in advance for your replies. Link to jsfiddle (watch console)

Answer 1

As far as I understand, you need to make the value of the id variable the arr key, if so, then like this:

var id = 'test', num = 141241, num2 = 12424;
var arr = {str: num};
arr[id] = num2;

Answer 2

It's not an array, it's an object. Objects are made up of keys and values.
And as far as I remember, the keys are not set in this way.