Experimenting with a polyfill for bind

Bind Polyfill

Function.prototype.bind = function(obj) {
  if (Function.prototype.bind) { return Function.prototype.bind.apply(this, arguments) }
  
	var that = this,
	    slice = function(a, b) { return a.length - (b || 0) ? Array.prototype.slice.call(a, b || 0) : [] },
	    concat = function(a, b) { return a.length ? b.length ? a.concat(b) : a : b; },
	    args = slice(arguments, 1);
	    
	return function() {
	  that.apply(obj, concat(args, slice(arguments)));
	};
}