Using an integer as a key in an associative array in JavaScript

Question

When I create a new JavaScript array, and use an integer as a key, each element of that array up to the integer is created as undefined.

For example:

v         


        

Answer 1

Use an object, as people are saying. However, note that you can not have integer keys. JavaScript will convert the integer to a string. The following outputs 20, not undefined:

var test = {}
test[2300] = 20;
console.log(test["2300"]);