Adding switch perf tests

Author: mattpodwysocki

tests/perf/operators/switch.js

@@ -0,0 +1,44 @@
+var RxOld = require('../old/rx.lite');
+var RxNew = require('../../../dist/rx.lite');
+var Benchmark = require('benchmark');
+
+var suite = new Benchmark.Suite;
+
+// Backfill range to get rid of differences
+RxOld.range = function (start, count) {
+  var scheduler = RxNew.Scheduler.currentThread;
+  return new RxNew.AnonymousObservable(function (observer) {
+    return scheduler.scheduleRecursiveWithState(0, function (i, self) {
+      if (i < count) {
+        observer.onNext(start + i);
+        self(i + 1);
+      } else {
+        observer.onCompleted();
+      }
+    });
+  });
+};
+RxNew.range = RxOld.range;
+
+// add tests
+suite.add('old', function() {
+  RxOld.Observable.range(0, 50)
+    .map(function (x) { return RxOld.Observable.range(x, 50)})
+    .switch()
+    .subscribe();
+})
+.add('new', function() {
+  RxNew.Observable.range(0, 50)
+    .map(function (x) { return RxNew.Observable.range(x, 50)})
+    .switch()
+    .subscribe();
+})
+// add listeners
+.on('cycle', function(event) {
+  console.log(String(event.target));
+})
+.on('complete', function() {
+  console.log('Fastest is ' + this.filter('fastest').pluck('name'));
+})
+// run async
+.run({ 'async': true });