What’s new in Angular 2?A COMPARISON BETWEEN NG1.X AND NG2

Alfred Jett GrandezaFounder, Leangineer @ Lean Consulting

leanconsulting.ph | ajgrandeza.com

Lean Consulting• Davao based start-up• Founded: February 2016• Lean Academy SOON!• More info:

• leanconsulting.ph• fb.com/leanconsutling.ph

About Me•Graduate of Ateneo de Davao, Computer Science 2012

•Over 5 years of software engineering experience, .NET and AngularJS

•Former CTO of T.H.E. Patrons

•Co-founder of Lean Consulting/Lean Academy

•Microsoft Technology Associate (2)

•Member of Davao .NET Community (Davao .NET Users Group, Philippine .NET Users Group)

•I do consulting and freelance work from clients overseas

•Advocate of .NET Technologies

•I LOVE TO LEARN!

Prerequisites & Tools• Required• JavaScript• HTML• CSS

• Helpful• OOP concepts

• Visual Studio Community• https://www.visualstudio.com/

• Visual Studio Code• https://code.visualstudio.com/

Single Page Application• SPAs are web apps that load a single HTML page and dynamically that page as the user interacts

• Much of the work happen in the client side

• Usually written in JavaScript

SPA Lifecycle

Angular is…• Open source, JavaScript based front-end framework

• Used for building client-side applications

• MVW Framework (Model-View-Whatever)

• Mainly maintained by Google

Why use Angular?• Expressive/Customizable HTML

• Powerful Data Binding

• Modular

• Easy back-end integration

Application Demo• NG 1.X App

• NG 2 App

Key Features of Angular 1.X• Directives

• Data binding

• Views

• Controllers

• $scope

• Modules

• Dependency Injection

• Routes

• Services

What is a directive?• Extends HTML attributes, with the prefix “ng-”

• Teaches HTML new tricks

• There are built-in directives• ng-app• ng-view

• You can also create your own custom directives

Data Binding• Interpolation• {{name}}

• Event Binding• ng-click=“onClick()”

• Two-way Binding• <input ng-model=“name” />

Filters & Pipes• Filters can be added to filter an array

•Pipes can be used to format a data

Views, Controllers, Scope•View – UI / Display

•Controllers – Controls the logic, data and flow

•$scope is the “glue” between controller and view or the ViewModel

Modules & DI• A container for the different parts of your Angular app

• You can package code as reusable modules

• You may inject different modules to your module• Dependency Injection

• Instantiate a module• ng-app=“”

• Creating a module• angular.module(‘demoApp’, [])

Routes• is used for deep-linking URLs to controllers and views

Services• Are for organizing and share code across your application

Summary for NG1 Key Features• Directives• Data binding• Views• Controllers• $scope• Modules• Dependency Injection• Routes• Services

Angular 2.0 with TypeScript

Live release: Sept 16, 2016

http://angularjs.blogspot.com/2016/09/angular2-final.html

Why Angular 2?• Built for speed

• Modern

• Simplified API

• Enhanced Productivity

• Develop Across All Platforms

What is TypeScript?• Open source programming language

• Developed and maintained by Microsoft

• A superset of JavaScript

• Transpiles to plain JavaScript

• Strongly typed

• Class based / OOP approach

• Learn more:• http://www.typescriptlang.org/Playground

Setting up• Download• https://github.com/angular/quickstart

Angular 2 Key Features• Components

• Templates

• Directives

• Data Binding & Pipes

• Life-cycle hooks

• Services

• Dependency Injection

• Routes

Anatomy of NG 2

Image grabbed from: https://www.pluralsight.com/courses/angular-2-getting-started

Anatomy of a Component

Image grabbed from: https://www.pluralsight.com/courses/angular-2-getting-started

Components

Image grabbed from: https://www.pluralsight.com/courses/angular-2-getting-started

ComponentsImport statements

Metadata & Template

Class

Decorator• A function that adds metadata to a class

• Prefixed with an @

• @Component()

Defining a Template in a Component• Inline template

•Linked Template

Data Binding• Coordinates communication between the component’s class and template

• Interpolation• {{name}}

• Event Binding• (click)=‘onClick()’

• Two-way Binding• <input [(ngModel)]=‘name’ />

• Property Binding• <img [src] = ‘customer.thumbnail’ />

Directive in NG2• Built-in directives• *ngIf• *ngFor

Pipes• | lowercase

• | currency

• | uppercase

• No more filter • You have to create your own pipe

Lifecycle Hooks• A component has a lifecycle

• Angular offers component lifecycle hooks that give us ability to capture these moments

• In other words, events

• Samples• OnInit• OnChanges• OnDestory

Services• Services are independent from any components

• To provide shared data, logic across multiple components

• Encapsulate external interactions (i.e. Rest API)

Services

Dependency Injection• A design pattern to resolve dependencies

Retrieve Data using HttpReturns Observables instead of Promises

What is RxJS?• RxJS is a javascript library for composing asynchronous & event-based programs by using observable sequences

• Used within Angular

• More info• http://reactivex.io/rxjs/

Promises vs Observable• Promise• Returns a single value• Not cancellable

• Observable• Works with multiple values over time• Cancellable• “Retryable”• Supports map, filter, reduce, etc..

Routing

Summary• Huge difference between NG1 & NG2, in terms of syntax

• NG2 is simpler in terms of Architecture

• TypeScript makes the job easier

References•https://angular.io/docs/ts/latest/quickstart.html

•https://www.pluralsight.com/courses/angular-2-getting-started

•https://auth0.com/blog/angular-2-series-part-2-domain-models-and-dependency-injection/

•https://auth0.com/blog/angular-2-series-part-3-using-http/