add loop tracker

ts/index.ts

@@ -2,6 +2,7 @@ import * as plugins from './lik.plugins'
 
 // import modules
 
-export * from './lik.stringmap'
+export * from './lik.looptracker'
 export * from './lik.objectmap'
 export * from './lik.observablemap'
+export * from './lik.stringmap'

ts/lik.looptracker.ts

@@ -0,0 +1,18 @@
+import * as plugins from './lik.plugins'
+
+import { Objectmap } from './lik.objectmap'
+
+export class LoopTracker<T> {
+  referenceObjectMap = new Objectmap<any>()
+  constructor () {
+    // nothing here
+  }
+
+  /**
+   * checks and tracks an object
+   * @param objectArg
+   */
+  checkAndTrack (objectArg: T) {
+    return this.referenceObjectMap.add(objectArg)
+  }
+}

ts/lik.objectmap.ts

@@ -23,9 +23,18 @@ export class Objectmap<T> {
 
   /**
    * add object to Objectmap
+   * returns false if the object is already in the map
+   * returns true if the object was added successfully
    */
-  add (objectArg: T) {
-    this.objectArray.push(objectArg)
+  add (objectArg: T): boolean {
+    if (this.checkForObject(objectArg)) {
+      // the object is already in the objectmap
+      return false
+    } else {
+      // the object is not yet in the objectmap
+      this.objectArray.push(objectArg)
+      return true
+    }
   }
 
   /**

ts/lik.plugins.ts

@@ -6,10 +6,10 @@ export import minimatch = require('minimatch')
 export import rx = require('rxjs/Rx')
 
 // workaround
-import {Operator} from 'rxjs/Operator';
-import {Observable} from 'rxjs/Observable';
+import {Operator} from 'rxjs/Operator'
+import {Observable} from 'rxjs/Observable'
 declare module 'rxjs/Subject' {
   interface Subject<T> {
-    lift<R>(operator: Operator<T, R>): Observable<R>;
+    lift<R>(operator: Operator<T, R>): Observable<R>
   }
 }