gistfile1.js

var ex = [
{id: 1, name: 'blah'},
{id: 2, name: 'blah'},
{id: 3, name: 'blah'},
{id: 3, name: 'blah'},
{id: 3, name: 'blah'},
{id: 3, name: 'blah'},
{id: 4, name: 'blah'}
]

var objectifier = {
	toObject: function(array, key) {
		var i = 0
		 ,  o = {}
		 ,  l = array.length;
		
		for(i; i < l; i++) {
			o[key ? array[i][key] : i] = array[i];
		}
		return o;
	},
	toArray: function(object) {
		var i = 0
		 ,  a = []
		 ,  key;
		
		for(key in object) {
			a.push(object[key]);
		}
		
		return a;
	},
	uniques: function(array, key) {
		return this.toArray(this.toObject(array, key));
	}
};

console.log(objectifier.uniques(ex, 'id'));

// outputs:
// [ { id: 1, name: 'blah' },
//   { id: 2, name: 'blah' },
//   { id: 3, name: 'blah' },
//   { id: 4, name: 'blah' } ]