The Observer object has the functions next() and error(). In this lesson we will see the other (and last) function available on observers, complete(), and its purpose. Completion is an important concept, as we will see later on. Imagine if you want t…

Whenever we are writing code, we need to remember that things may go wrong. If an error happens in a function, that error will be thrown. Errors can also happen in Observables, and in this lesson we will see what is the API for throwing and catching…

When a stream has completed, you often need to evaluate everything that has happened while the stream was running. This lesson covers how to use reduce to collect values and total up a “score” of this simple game. const Observable = Rx.Observable; co…

我使用 angular-cli 来搭建项目. ng new infinite-scroller-poc --style=scss 项目生成好后,进入 infinite-scroller-poc 目录下. Angular CLI 提供了一堆命令用来生成组件.指令.服务和模块. 我们来生成一个服务和一个指令. ng g service hacker-news ng g directive infinite-scroller 注意: Angular CLI 会自动在 app.module.ts 里注册…

对于一个应用来说,获取数据的方法可以有很多,比如:Ajax, Websockets, LocalStorage, Indexdb, Service Workers,但是如何整合多种数据源.如何避免BUG.如何提高可维护性.如何提升应用的速度,这些却又是需要解决的问题.MVC是经典的Web应用开发模式,但对于客户端应用却不太适合.针对这点又出现了一些其它的模式,比如MVW(Model-View-Whatever)双向绑定模式.Flux.Observables等. Angular1采用双向绑定的方式…

一 merge操作符 把多个 Observables 的值混合到一个 Observable 中 import { Component, OnInit } from '@angular/core'; import { of } from 'rxjs/observable/of'; import { range } from 'rxjs/observable/range'; import { merge } from 'rxjs/observable/merge'; import { Observa…

With the connect() method on a ConnectableObservable, the programmer is responsible for avoiding leaked executions of shared RxJS Observables. This lesson will teach you about refCount(), a handy operator that creates an automatically connected Obser…

原文: https://codingthesmartway.com/getting-started-with-rxjs-part-1-setting-up-the-development-environment-creating-observables/ ---------------------------------------------------------------- Getting Started With RxJS – Part 1: Setting Up The Develo…

Some Observables may complete, and we may want to append another Observable to the one which just completed. This lesson teaches you how to use the concat() operator for either appending or prepending, and how the shortcut operator startWith() is an…

We will learn how to perform network requests to a backend using RxJS Observables. A example of basic jquery request: console.clear(); var requestStream = Rx.Observable.just('https://api.github.com/users'); //Current requestStream is just a stream //…