remove notification duplicate

src/app/store/notification-holder.service.ts

@@ -1,6 +1,6 @@
 import { Injectable } from '@angular/core';
 import { StorageService } from '../services/storage.service';
-
+import { v4 as uuidv4 } from 'uuid'
 @Injectable({
   providedIn: 'root'
 })
@@ -8,9 +8,12 @@ export class NotificationHolderService {
 
   notificationList = []
 
+  private _notificationList = []
+
+
   constructor(
     private storageService: StorageService,
-  ) { 
+  ) {
 
     try {
       this.restore()
@@ -18,27 +21,34 @@ export class NotificationHolderService {
 
   }
 
+
+  reverse() {
+    this.notificationList = this._notificationList.reverse()
+  }
+
   restore() {
     this.storageService.get("Notifications").then((store) => {
       if(Array.isArray(store)) {
-        this.notificationList = store
+        this._notificationList = store
+        this.reverse()
       }
     }).catch((error) => {})
   }
 
   save() {
-    this.storageService.store("Notifications", this.notificationList)
+    this.storageService.store("Notifications", this._notificationList)
   }
 
   addNotification(notification) {
 
     const element = notification
-    const i = this.notificationList.length + 1
-   
+    const i = this._notificationList.length + 1
+
     let notificationObject;
     if (element.notification) {
 
       notificationObject = {
+        id: notification?.id || uuidv4(),
         index: i,
         title: element.notification.title,
         Service: element.data.Service,
@@ -57,6 +67,7 @@ export class NotificationHolderService {
 
     } else if (element.data) {
       notificationObject = {
+        id: notification?.id || uuidv4(),
         index: i,
         title: element.title,
         Service: element.data.Service,
@@ -76,6 +87,7 @@ export class NotificationHolderService {
     } else {
       {
         notificationObject = {
+          id: notification?.id || uuidv4(),
           FolderId: element.FolderId,
           IdObject: element.IdObject,
           Location: element.Location,
@@ -94,8 +106,19 @@ export class NotificationHolderService {
       }
     }
 
-    this.notificationList.push(notificationObject)
-    this.save()
+    if(this.notificationExist(notificationObject)) {
+      this._notificationList.push(notificationObject)
+      this.reverse()
+      this.save()
+    }
+
+  }
+
+
+  notificationExist(notificationObject) {
+    return this._notificationList.find(item => {
+      return item.id === notificationObject.id;
+    });
   }
 
 
@@ -109,9 +132,11 @@ export class NotificationHolderService {
   }
 
   removeNotification(notification) {
-    this.notificationList = this.notificationList.filter( (e) => {
+    this._notificationList = this._notificationList.filter( (e) => {
       return e.index != notification.index
     })
+
+    this.reverse()
     this.save()
   }