function.bind.js

/*
var getName = function(){return 'My name is '+this.name};
var Person = function(name){
  this.name = name;
};

var Joe = new Person('Joe');

var joeName = getName.bind(Joe);

joeName() // => 'My name is Joe'
*/
if(typeof Function.prototype.bind == 'undefined'){
  Function.prototype.bind = function(context, args){
    var f = this;
    return function(){
      return f.apply(context, Array.prototype.slice.call(args || [])
        .concat(Array.prototype.slice.call(arguments)));
    };
  };
}