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Smit Thakkar Lead Software Developer LendCypher 

Flask-NSFW https://github.com/smitthakkar96 

Agenda ● Getting started with Angular2 ● Angular2 setup ● Demo#1 Typeahead ○ Typeahead Classical Style - Response Order ○ Inefficiency with Classical Style ○ Typeahead : now with streams ■ Forms Control ■ Throttling ■ SwitchMap ■ View Binding and async pipe ● Demo#2 ○ Diving deep into RxJx 

Environment used ● VS Code ● TypeScript ● NodeJs and NPM ● Angular CLI 

What’s new in Angular2 ● Performance Improvements ● Mobile Support ● TypeScript ● No $Scope ● Component based programming ● Reactive Programming 

Building Blocks of Angular2 

Angular2 Components import { Component } from '@angular/core'; @Component({ selector: 'my-app', template: `

Hello {{name}}

` }) export class AppComponent { name = 'Angular'; } AngularJs Controllers var myApp = angular.module('myApp',[]); myApp.controller('DoubleController', ['$scope', function($scope) { $scope.double = function(value) { return value * 2; }; }]); Components 

Providers Angular2 Provider import {Injectable} from 'angular2/core'; @Injectable() export class CarService { getCars = () => [ { id: 1, name: 'BMW' }, { id: 2, name: 'Suzuki' }, { id: 3, name: 'Volkswagen' } ]; } AngularJs Factory / Services var mainApp = angular.module("mainApp", []); mainApp.factory('MathService', function() { var factory = {}; factory.multiply = function(a, b) { return a * b } return factory; }); 

Pipes import { Pipe, PipeTransform } from '@angular/core'; @Pipe({name: 'capitalize'}) export class CapitalizePipe implements PipeTransform { transform(value: string, args: string[]): any { if (!value) return value; return value.replace(/\w\S*/g, function(txt) { return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase(); }); } } 

Observables 

What is RsJx? A Powerful implementation of observable. Hundreds of contributors Largely developed and maintained by Microsoft and Netflix It has all sets of combinators which you need. 

An Observable is like a Stream (in many languages) and allows to pass zero or more events where the callback is called for each event. Often Observable is preferred over Promise because it provides the features of Promise and more. With Observable it doesn't matter if you want to handle 0, 1, or multiple events. You can utilize the same API in each case. Observable also has the advantage over Promise to be cancelable. If the result of an HTTP request to a server or some other expensive async operation isn't needed anymore, the Subscription of an Observable allows to cancel the subscription, while a Promise will eventually call the success or failed callback even when you don't need the notification or the result it provides anymore. Observable provides operators like map, forEach, reduce, ... similar to an array There are also powerful operators like retry(), or replay(), ... that are often quite handy. What are Observables? 

Typeahead Classical Style 

Typeahead Classical Style - Throttle 

Typeahead Classical Style - Response Order 

Out-of-Band and Side Effects 

Inefficiency 

Typeahead: now with streams 

Angular2 Forms 

Angular2 Forms Control 

Angular2 Forms: Control Value Changes 

Event Flow Step One: Throttling 

Angular2 Http 

Event Flow Step 2: Ticker Loader 

Event Flow Step 3: SwitchMap 

Event Flow 4: View Binding 

Async Pipe 

Event Flow 4: View Binding with Pipes 

Q&A Queries and Issues are heartily welcome 

Thank You! 

[email protected] github.com/smitthakkar96 facebook.com/geekysmit