@@ -831,8 +831,36 @@ function example(){
831831}
832832```
833833
834- * one typical example is borrowing ```Array`` methods for the ```arguments``` object
834+ * one typical example is borrowing ```Array``` methods for the ```arguments``` object
835835
836836### borrow and bind
837837
838- ...
838+ * with call/apply ```this``` reference has to be passed in when called
839+ * sometimes it's better to locked/bound to specific object in advance
840+ * ```bind``` function binds a method to an object
841+
842+ ```js
843+ //simple bind function
844+ function bind (object, method) {
845+ return function() {
846+ return method.apply(object, [].slice.call(arguments));
847+ }
848+ }
849+ ```
850+
851+ ### ```Function.prototype.bind```
852+
853+ * ES5 has bind builtin, it also accepts partial argument list
854+
855+ ```js
856+ //basic implementation handling partial application
857+ Function.prototype.bind = Function.prototype.bind || function(thisArg) {
858+ var fn = this;
859+ var slice = Array.prototype.slice;
860+ var args = slice.call(arguments, 1);
861+
862+ return function () {
863+ return fn.call(thisArg, args.concat(slice.call(arguments)))
864+ }
865+ }
866+ ````
0 commit comments