Dynamic property names in object literals

dynamic_property_names_in_object_literals.js

// Can we get something like this??

var howManyRainbows = 'double';

var rainbow = {
  (howManyRainbows): true
};

if (rainbow.double) {
  alert('What does it mean?');
}

Yep, just as @getify said, there are other ways of accomplishing this in JavaScript, but I'd like to see if anyone else finds something like what I'm doing useful.

For example:

var quxx = {
  corge: 1,
  grault: false,
  (foo): true,
  (baz): 9001
};

I'd rather construct my object in one fell swoop, instead of:

var foo = 'bar'
  , baz = 'qux';

var quxx = {
  corge: 1,
  grault: false
};
quxx[foo] = true;
quxx[baz] = 9001;

@Singles, my apologies for being vague in my question.