[RxJS] Utility operator: do
Posted Answer1215
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了[RxJS] Utility operator: do相关的知识,希望对你有一定的参考价值。
We just saw map which is a transformation operator. There are a couple of categories of operators, such as filtering, combination, flattening, etc. One of these categories is the utility operators. The most important utility operator is do
, useful for debugging.
var foo = Rx.Observable.interval(200).take(4); /* foo: ---0---1---2---3--... do(x => console.log(‘before ‘ + x)) ---0---1---2---3--... map(x => x * 2) ---0---2---4---6--... do(x => console.log(‘after ‘ + x)) ---0---2---4---6--... */ var bar = foo .do(x => console.log(‘before ‘ + x)) .map(x => x * 2) .do(x => console.log(‘after ‘ + x)); bar.subscribe( function (x) { console.log(‘next ‘ + x); }, function (err) { console.log(‘error ‘ + err); }, function () { console.log(‘done‘); }, );
以上是关于[RxJS] Utility operator: do的主要内容,如果未能解决你的问题,请参考以下文章
[RxJS] What RxJS operators are
Eslint 'rxjs/operators' 应该列在项目的依赖中
[RxJS] Combination operator: withLatestFrom
[RxJS] Combination operator: zip