diff --git a/Observable.js b/Observable.js
index 03545cd..b20be57 100644
--- a/Observable.js
+++ b/Observable.js
@@ -11,12 +11,21 @@ class ObserverList {
   }
   add(observer) {
     // todo add observer to list
+    this.observerList.push(observer);
   }
   remove(observer) {
     // todo remove observer from list
+    let index = 0;
+    this.observerList.forEach(element => {
+      if(element === observer){
+        this.observerList.splice(index, 1)
+      }
+      index++;
+    });
   }
   count() {
     // return observer list size
+    return this.observerList.length;
   }
 }
 
@@ -26,13 +35,18 @@ class Subject {
   }
   addObserver(observer) {
     // todo add observer
+    this.observers.add(observer);
   }
   removeObserver(observer) {
     // todo remove observer
+    this.observers.remove( this.observers.observerList.indexOf(observer) );
   }
   notify(...args) {
     // todo notify
+    this.observers.observerList.map( observer => {
+        observer.update.call( observer, ...args);
+    })
   }
 }
 
-module.exports = { Subject };
\ No newline at end of file
+module.exports = { Subject };
diff --git a/PubSub.js b/PubSub.js
index 0c7999e..8052230 100644
--- a/PubSub.js
+++ b/PubSub.js
@@ -13,14 +13,37 @@ module.exports = class PubSub {
 
   subscribe(type, fn) {
     // todo subscribe
+    if( !this.subscribers[type] ){
+      this.subscribers[type] = [];
+    }
+    this.subscribers[type].push(fn);
   }
 
   unsubscribe(type, fn) {
     // todo unsubscribe
+    if (!this.subscribers[type]) {
+      return false;
+    } else {
+      let queue = this.subscribers[type];
+      let index = 0;
+      queue.forEach(element => {
+        if(element === fn){
+          queue.splice(index, 1)
+        }
+        index++;
+      });
+    }
   }
 
   publish(type, ...args) {
     // todo publish
+    if (!this.subscribers[type]) {
+      return false;
+    } else {
+      this.subscribers[type].forEach(element => {
+         element.apply(this, args)
+      });
+    }
   }
 
 }