From feea9a11f1d40a70b2927167f7cabcdb9ed84979 Mon Sep 17 00:00:00 2001
From: Ben Lesh <blesh@netflix.com>
Date: Thu, 3 Dec 2015 13:36:02 -0800
Subject: [PATCH] feat(bindCallback): remove thisArg

thisArg is removed as this method does not mirror any native function with a thisArg

related #878
---
 spec/observables/bindCallback-spec.js | 19 ++-----------------
 src/Observable.ts                     |  2 +-
 src/observable/bindCallback.ts        | 11 ++++-------
 3 files changed, 7 insertions(+), 25 deletions(-)

diff --git a/spec/observables/bindCallback-spec.js b/spec/observables/bindCallback-spec.js
index e5395f4b9a..c57195303b 100644
--- a/spec/observables/bindCallback-spec.js
+++ b/spec/observables/bindCallback-spec.js
@@ -22,7 +22,7 @@ describe('Observable.bindCallback', function () {
     function callback(datum, cb) {
       cb(null, datum);
     }
-    var boundCallback = Observable.bindCallback(callback, null, function (err, datum) { return datum; });
+    var boundCallback = Observable.bindCallback(callback, function (err, datum) { return datum; });
 
     boundCallback(42)
       .subscribe(function (x) {
@@ -33,26 +33,11 @@ describe('Observable.bindCallback', function () {
       done);
   });
 
-  it('should override `this` in the callback', function (done) {
-    function callback(cb) {
-      cb(this.value);
-    }
-    var boundCallback = Observable.bindCallback(callback, {value: 42});
-
-    boundCallback()
-      .subscribe(function (x) {
-        expect(x).toBe(42);
-      }, function () {
-        done.fail('should not be called');
-      },
-      done);
-  });
-
   it('should emit an error when the selector throws', function (done) {
     function callback(cb) {
       cb(42);
     }
-    var boundCallback = Observable.bindCallback(callback, null, function (err) { throw new Error('Yikes!'); });
+    var boundCallback = Observable.bindCallback(callback, function (err) { throw new Error('Yikes!'); });
 
     boundCallback()
       .subscribe(function () {
diff --git a/src/Observable.ts b/src/Observable.ts
index 1decd4a02a..06eec0a64b 100644
--- a/src/Observable.ts
+++ b/src/Observable.ts
@@ -134,7 +134,7 @@ export class Observable<T> implements CoreOperators<T>  {
   }
 
   // static method stubs
-  static bindCallback: <T>(callbackFunc: Function, ctx?: Object, selector?: Function, scheduler?: Scheduler) => Function;
+  static bindCallback: <T>(callbackFunc: Function, selector?: Function, scheduler?: Scheduler) => Function;
   static combineLatest: <T>(...observables: Array<Observable<any> |
                                                   Array<Observable<any>> |
                                                   ((...values: Array<any>) => T) |
diff --git a/src/observable/bindCallback.ts b/src/observable/bindCallback.ts
index bcbdbb7595..b25d41990c 100644
--- a/src/observable/bindCallback.ts
+++ b/src/observable/bindCallback.ts
@@ -12,16 +12,14 @@ export class BoundCallbackObservable<T> extends Observable<T> {
   value: T | T[];
 
   static create<T>(callbackFunc: Function,
-                   ctx: Object = undefined,
                    selector: Function = undefined,
                    scheduler: Scheduler = immediate): Function {
     return (...args): Observable<T> => {
-      return new BoundCallbackObservable(callbackFunc, ctx, selector, args, scheduler);
+      return new BoundCallbackObservable(callbackFunc, selector, args, scheduler);
     };
   }
 
   constructor(private callbackFunc: Function,
-              private ctx,
               private selector,
               private args: any[],
               public scheduler: Scheduler = immediate) {
@@ -30,7 +28,6 @@ export class BoundCallbackObservable<T> extends Observable<T> {
 
   _subscribe(subscriber: Subscriber<T | T[]>) {
     const callbackFunc = this.callbackFunc;
-    const ctx = this.ctx;
     const selector = this.selector;
     const args = this.args;
     const scheduler = this.scheduler;
@@ -49,7 +46,7 @@ export class BoundCallbackObservable<T> extends Observable<T> {
           this.value = innerArgs;
 
           if (selector) {
-            results = tryCatch(selector).apply(ctx, innerArgs);
+            results = tryCatch(selector).apply(this, innerArgs);
             if (results === errorObject) { return subscriber.error(results.e); }
             subscriber.next(results);
           } else {
@@ -74,7 +71,7 @@ export class BoundCallbackObservable<T> extends Observable<T> {
           this._isScalar = true;
 
           if (selector) {
-            results = tryCatch(selector).apply(ctx, innerArgs);
+            results = tryCatch(selector).apply(this, innerArgs);
             if (results === errorObject) {
               return subscription.add(scheduler.schedule(dispatchError, 0, { err: results.e, subscriber }));
             }
@@ -95,7 +92,7 @@ export class BoundCallbackObservable<T> extends Observable<T> {
 
     if (handler) {
       args.push(handler);
-      callbackFunc.apply(ctx, args);
+      callbackFunc.apply(this, args);
     }
   }
 }