我对操作符withLatestFrom有一个意外的行为。
输出
map a
a
map a <== why a is mapped again ?
map b
b
const { Subject, operators } = window.rxjs
const { map, withLatestFrom } = operators
const createA = new Subject()
const createB = new Subject()
const a = createA.pipe(
map(() => console.log('map a'
我知道当订阅Observable时,RxJ observables是随着时间的推移而产生的异步集合。
现在我想使用RxJs运算符作为Linq运算符。我的问题是如何在Array而不是Observables上使用RxJs运算符。
例如,我想知道有多少个Array集合的实例匹配特定的过滤器:
let countMatchingMembers = (collection: Array<any>): number => {
// I want to use on collection instead of Rx.Observable
const matchingMemb
假设我有一个这样的Person结构数组: struct Person {
var name: String
}
var persons = [Person(name: "A"), Person(name: "B"), Person(name: "C")]
let publisher = CurrentValueSubject<[Person], Never>(persons)
// subscribe to changes to the array
let subscription: AnyCancellable =