MDN: bindを切り出したソース

gistfile1.txt

  // -----------------------------------------------------------------
	// MDN: bind
	// @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind
	// -----------------------------------------------------------------

	if (!Function.prototype.bind) {
		Function.prototype.bind = function (oThis) {
			if (typeof this !== "function") {
				// closest thing possible to the ECMAScript 5 internal IsCallable function
				throw new TypeError("Function.prototype.bind - what is trying to be bound is not callable");
			}

			var aArgs = Array.prototype.slice.call(arguments, 1),
				fToBind = this,
				fNOP = function () {},
				fBound = function () {
					return fToBind.apply(this instanceof fNOP && oThis ? this : oThis, aArgs.concat(Array.prototype.slice.call(arguments)));
				};

			fNOP.prototype = this.prototype;
			fBound.prototype = new fNOP();

			return fBound;
		};
	}
	// -----------------------------------------------------------------