An efficient way to get the difference between two arrays of objects?

Question

I have two arrays of objects:

var a = [  {\'id\': 20},   {\'id\': 15},   {\'id\': 10},   {\'id\': 17},   {\'id\': 23}  ];

var b = [ {\'id\': 90},   {\'id\         


        

Answer 1

If you not adverse to including a library use underscore.js it has a good intersection function http://documentcloud.github.com/underscore/