perf(count): fast-path for counting over scalars

benlesh · benlesh · commit c35a120a738f · 2015-10-14T10:06:09.000-07:00
diff --git a/src/observables/ScalarObservable.ts b/src/observables/ScalarObservable.ts
@@ -89,4 +89,8 @@ export default class ScalarObservable<T> extends Observable<T> {
   scan<R>(project: (acc: R, x: T) => R, acc?: R): Observable<R> {
     return this.reduce(project, acc);
   }
+
+  count(): Observable<number> {
+    return new ScalarObservable(1);
+  }
 }

Original file line number	Diff line number	Diff line change
`@@ -89,4 +89,8 @@ export default class ScalarObservable<T> extends Observable<T> {`
`89`	`89`	`scan<R>(project: (acc: R, x: T) => R, acc?: R): Observable<R> {`
`90`	`90`	`return this.reduce(project, acc);`
`91`	`91`	`}`
	`92`	`+`
	`93`	`+ count(): Observable<number> {`
	`94`	`+ return new ScalarObservable(1);`
	`95`	`+ }`
`92`	`96`	`}`