{"id":834,"date":"2016-03-07T21:39:09","date_gmt":"2016-03-07T21:39:09","guid":{"rendered":"https:\/\/ionic.io\/blog\/?p=834"},"modified":"2016-03-15T18:26:46","modified_gmt":"2016-03-15T18:26:46","slug":"angular-is-a-design-pattern","status":"publish","type":"post","link":"https:\/\/ionic.io\/blog\/angular-is-a-design-pattern","title":{"rendered":"Angular is a Design Pattern"},"content":{"rendered":"

\"angular-design-pattern\"

With Angular 2.0 fast approaching and the world of frontend frameworks in a massive transition, there’s been a lot of concern about the impending costs of moving to the next generation of Angular. Do developers have to learn yet another new framework?<\/p>\n

Few teams have spent as much time with Angular 2 as the Ionic team has. We started building Ionic 2 back when Angular 2 was pre-alpha, with the dream of offering a faster, more standards-compliant, and future-proof mobile web framework than Angular 1 could provide.<\/p>\n

One of the major realizations we’ve had from working on Ionic 2 is how similar Angular 2 and Angular 1 are at a high level, and how understanding this will help developers move from Angular 1 to Angular 2 far more easily. In many ways, Angular 2 isn’t really a new framework at all, just a new implementation of the same one we’ve come to know and love.
\n<\/p>\n

One framework, multiple implementations<\/h3>\n

With Angular 1, Angular 2, and Angular Dart, Angular has gone from a specific ES5 frontend framework, to a conceptual framework or design pattern<\/em> with multiple implementations.<\/p>\n

One can build UIs and frontend applications in the Angular style with a choice of at least three major language implementations: ES5, ES6\/TypeScript, and Dart, though ES6\/TypeScript is becoming the de facto Angular standard (i.e. don’t use Dart!).<\/p>\n

If we take a closer look at how Angular apps work in each language, we start to see a ton of similarities. Let’s check out an example:<\/p>\n

Example<\/h3>\n

To output a property from our scope or context, we can do this:<\/p>\n

Angular 1:<\/p>\n

<span>Today is {{todaysDate | date}}<\/span>\n<\/code><\/pre>\n
Angular Dart:<\/p>\n
<span>Today is {{todaysDate | date}}<\/span>\n<\/code><\/pre>\n
Angular 2:<\/p>\n
<span>Today is {{todaysDate | date}}<\/span>\n<\/code><\/pre>\n
Notice anything? They’re exactly the same! Let’s try a more complicated example with a theoretical list of songs:<\/p>\n
In Angular 1 and Angular Dart:<\/p>\n
<ion-list>\n  <ion-item ng-repeat="song in songs" ng-click="openSong(song)">\n    {{song.artist}} - {{song.title}}\n    <span ng-if="song.isFavorite"><i class="icon ion-heart"><\/i><\/span>\n  <\/ion-item>\n<\/ion-list>\n<\/code><\/pre>\n
And Angular 2 (w\/ Ionic 2):<\/p>\n
<ion-list>\n  <ion-item *ngFor="#song of songs" (click)="openSong(song)">\n    {{song.artist}} - {{song.title}}\n    <span *ngIf="song.isFavorite"><ion-icon name="heart"><\/ion-icon><\/span>\n  <\/ion-item>\n<\/ion-list>\n<\/code><\/pre>\n
Okay, we see more differences here, but the changes are well defined: ng-repeat<\/code> is now ngFor<\/code>, with a *<\/code> used to denote this element as a template (that will be stamped out N times). Iteration uses “of” instead of “in” to grab the values of the list which is more inline with how iteration works in ES6 and TypeScript. We no longer use kebab-casing (i.e. ng-repeat) for attributes since Angular 2 decided to move to a more explicit naming convention (more on this<\/a>).<\/p>\n
If we apply a standard Angular 1 to Angular 2 syntax transformation, we have code that, conceptually, is identical to Angular 1 and Angular 2. We can look at this code and immediately understand the intention of it, assuming we’re already familiar with Angular.<\/p>\n
Component Example<\/h3>\n
Most Angular users will find templates straight forward in Angular 2. A much bigger change comes with the new component model that replaces the directive\/controller setup from Angular 1.<\/p>\n
In Angular 1:<\/p>\n
.controller('HomeCtrl', function($scope) {\n  \/\/ controller for this "page"\n})\n\n.directive('profileImage', [function() {\n  \/\/ ... directive here\n}])\n<\/code><\/pre>\n
In Angular 2, since everything is a component, we can apply a simple transformation: turn controllers into components and turn ng1 directives into components.<\/p>\n
Since Angular 2 lives and breathes TypeScript and ES6, we express “components” as classes that can (optionally) have a template attached. The analog to the above Angular 1 code would look like this in Angular 2:<\/p>\n
import {Component} from 'angular2\/core';\n\n@Component({\n    selector: 'home',\n    template: '<div>home<\/div>'\n})\nexport class HomeComponent { }\n<\/code><\/pre>\n
And the Angular 1 directive as an Angular 2 component:<\/p>\n
@Component({\n    selector: 'profile-image',\n    template: '<div>profile image<\/div>'\n})\nexport class ProfileImageComponent { }\n<\/code><\/pre>\n
Scope?<\/h3>\n
In Angular 1, scope was really just the “context” available to a region of the UI. For example, our profileImage<\/code> directive might have a reference to the current user as part of its scope, or context, so it could render the user’s profile image.<\/p>\n
This concept is exactly the same in ng2, except we use the natural ES6 concept of class instance data! Angular has gone from a custom context system to a standards-based approach since JavaScript has evolved to make this possible (with a little TypeScript decorator magic to make it cleaner):<\/p>\n
export class ProfileImageComponent {\n  @Input() user;\n\n  clickFace() {\n    \/\/ this.user is available, much like $scope.user would have been in ng1\n  }\n}\n<\/code><\/pre>\n
In Angular 2 we no longer need to have a custom $scope<\/code> system to handle data for components, we get it for free* with ES6 and TypeScript!<\/p>\n
*oversimplification, but it feels free to the end user!<\/em><\/p>\n
Reducing the barrier to entry<\/h3>\n
Us Angular 1 veterans tend to forget how difficult it was to grok<\/em> Angular 1. I know I had to take a month off from a lot of my other work to just understand what all these random terms like transclusion<\/em>, directives<\/em>, linking<\/em>, scope<\/em>, and so on actually meant<\/em>.<\/p>\n
A developer new to Angular and starting with Angular 2 will hopefully have way less domain-specific knowledge to learn since they can skip all the esoteric terms from Angular 1 and jump right into ES6\/TypeScript code.<\/p>\n
Plus, with no custom module system, Angular 2 code interops with the rest of the ES6 ecosystem, making it dead simple to install and import 3rd party code.<\/p>\n
Angular all the way down<\/h3>\n
Once developers make the mental switch from the syntax<\/em> of Angular 1 to Angular 2, we think they’ll find that they already know Angular 2<\/em>. The concepts are practically identical, and the similarities don’t stop with templates and components; as users dig into pipes, dependency injection, and services, they’ll find tons of similar similarities (I like the sound of that).<\/p>\n
Since there is so much overlap, we’ve tried to make Ionic 2 feel similar to Ionic 1, since it’s still based on Angular, just a new, better implementation of it! So far it seems to be going over really well and I’m optimistic that Angular 2 is going to be a major hit now that the dust is settling and the Angular 2 APIs are stabilizing.<\/p>\n
Angular 2 is really just a better Angular!<\/p>\n","protected":false},"excerpt":{"rendered":"
With Angular 2.0 fast approaching and the world of frontend frameworks in a massive transition, there’s been a lot of concern about the impending costs of moving to the next generation of Angular. Do developers have to learn yet another new framework? 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