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September 7, 2017 14:45
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Learning the RxJS - Excerpted from the talk by André Staltz (https://youtu.be/uQ1zhJHclvs)
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| function map(transformFn) { | |
| const inputObservable = this | |
| const outputObservable = createObervable((outputObservable) => { | |
| inputObservable.subscribe({ | |
| next: (x) => { | |
| const y = transformFn(x) | |
| outputObservable.next(y) | |
| }, | |
| error: (err) => outputObservable.error(err), | |
| complete: () => outputObservable.complete() | |
| }) | |
| }) | |
| return outputObservable | |
| } | |
| function filter(conditionFn) { | |
| const inputObservable = this | |
| const outputObservable = createObervable((outputObservable) => { | |
| inputObservable.subscribe({ | |
| next: (x) => { | |
| if (conditionFn(x)) { | |
| outputObservable.next(x) | |
| } | |
| }, | |
| error: (err) => outputObservable.error(err), | |
| complete: () => outputObservable.complete() | |
| }) | |
| }) | |
| return outputObservable | |
| } | |
| function delay(period) { | |
| const inputObservable = this | |
| const outputObservable = createObervable((outputObservable) => { | |
| inputObservable.subscribe({ | |
| next: (x) => { | |
| setTimeout(() => outputObservable.next(x), period) | |
| }, | |
| error: (err) => outputObservable.error(err), | |
| complete: () => outputObservable.complete() | |
| }) | |
| }) | |
| return outputObservable | |
| } | |
| function createObervable(subscribe) { | |
| return { | |
| subscribe: subscribe, | |
| map: map, | |
| filter: filter, | |
| delay: delay | |
| } | |
| } | |
| const arrayObervable = createObervable((ob) => { | |
| [10, 20, 30].forEach(ob.next) | |
| ob.complete() | |
| }) | |
| const clickObervable = createObervable((ob) => { | |
| document.addEventListener('click', ob.next) | |
| }) | |
| const observer = { | |
| next: (data) => { | |
| console.log(data) | |
| }, | |
| error: (err) => { | |
| console.error(err) | |
| }, | |
| complete: () => { | |
| console.log('done') | |
| } | |
| } | |
| arrayObervable | |
| .map((e) => e.clientX) | |
| .filter((x) => x < 200) | |
| .delay(2000) | |
| .subscribe(observer) |
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