JavaScript: How to build key-value pairs

Question

In jQuery you can pass key-value pairs like this

$(this).colorbox({ width:100, height:500 });

I'm wondering if there is a way to build such key-value pair, eg. something like this

var pairs = ???;

if(someCondition)
  pairs.Add('width', '100');
else
  pairs.Add('maxWidth', '200');

$(this).colorbox(pairs);

Answer 1

var obj = {};
obj[key] = value;

You create an object, then assign your values under your keys.

Answer 2

There's no prototyped method to do this, but you'd probably just use regular property access capabilities...

if(someCondition)
  pair.width = '100';
else
  pair.maxWidth = '200';