Why use self when we have bind?

lib/emitters/custom-event-emitter.js

@@ -4,16 +4,13 @@ var util         = require("util")
 module.exports = (function() {
 module.exports = (function() {
   var CustomEventEmitter = function(fct) {
   var CustomEventEmitter = function(fct) {
     this.fct = fct
     this.fct = fct
-    var self = this
   }
   }
   util.inherits(CustomEventEmitter, EventEmitter)
   util.inherits(CustomEventEmitter, EventEmitter)
 
 
   CustomEventEmitter.prototype.run = function() {
   CustomEventEmitter.prototype.run = function() {
-    var self = this
-    
     process.nextTick(function() {
     process.nextTick(function() {
-      if (self.fct) {
-        self.fct.call(self, self)
+      if (this.fct) {
+        this.fct.call(this, this)
       }
       }
     }.bind(this))
     }.bind(this))