How to reach the conditions of the result

import { Component } from '@angular/core';
import { NavController, ViewController } from 'ionic-angular';

import { HomeService } from './home.service';

export class User {
  username: string;
  password: string;
}


@Component({
    selector: 'page-home',
    templateUrl: 'home.html',
    providers: [
      HomeService
    ]
})

export class HomePage {

  user: User = {
    username: '',
    password: ''
  }


  
  items:any;

 

    constructor(public navCtrl: NavController, public service: HomeService) { }

    login() {
        this.service.getFunctions(this.user)
                    .subscribe(
                        datas => {
                              if(datas)
                                   console.log(datas)
                                          });
                                      }
                                  }

This is my home.ts it returns me in 2 ways:

If the login and password are correct it returns me:

Object {result: true, dados: object}

dados: Object

ID:"1"
LOGIN:"otacio"
NAME: “OTACIO”

If they are wrong, it returns me:

Object {result: false, msg: “INCORRECT USER”}

What I need:

When the result is true direct to the page: menu

When the result is false display invalid user message or password.

I know the question may be simple, but it is that I am starting in ionic and angular now.

General information:

Ionic Version: 2.2.1
Node Version:v7.5.0

Here is the structure I use for situations like this.