How best to do a JavaScript array with non-consecutive indexes?

Question

I\'m writing a Google Chrome extension, in JavaScript, and I want to use an array to store a bunch of objects, but I want the indexes to be specific non-consecutive

Answer 1

You could attempt to do something like this to make it loud and clear to the JIST compiler that this is a more objecty-ish array like so:

    window.SparseArray = function(len){
      if (typeof len === 'number')
        if (0 <= len && len <= (-1>>>0))
          this.length = len;
        else
          new Array(len); // throws an Invalid array length type error
      else
        this.push.apply(this, arguments);
    }
    window.SparseArray.prototype = Array.prototype