Created
January 28, 2019 14:45
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groupBy use-case
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let Rx = window['rxjs']; | |
let {from, of, asyncScheduler} = Rx; | |
let {mergeMap, filter, delay, groupBy, throttleTime} = Rx.operators; | |
console.clear(); | |
let throttleSelectiveFilter = (throttleTimeout = 0, selector = (x) => x) => { | |
return (source) => { | |
return source.pipe( | |
groupBy(selector), | |
mergeMap((group$) => group$.pipe(throttleTime(throttleTimeout))) | |
) | |
} | |
} | |
let notifications = [ | |
{ userId: 1, name: 'A1', delay: 100 }, // should be shown | |
{ userId: 1, name: 'A2', delay: 1500 }, // shouldn't be shown | |
{ userId: 1, name: 'A3', delay: 2500 }, // shouldn't be shown | |
{ userId: 1, name: 'A4', delay: 3500 }, // should be shown | |
{ userId: 2, name: 'B1', delay: 200 }, // should be shown | |
{ userId: 2, name: 'B2', delay: 300 }, // shouldn't be shown | |
{ userId: 2, name: 'B3', delay: 3500 }, // should be shown | |
] | |
let source$ = from(notifications).pipe( | |
mergeMap((notif) => { | |
return of(notif).pipe(delay(notif.delay)); | |
}), | |
) | |
source$ | |
.pipe(throttleSelectiveFilter(3000, (x) => x.userId)) | |
.subscribe(showNotification); | |
let container = document.querySelector('.container'); | |
function showNotification(notif) { | |
const newElem = document.createElement('div'); | |
newElem.classList.add('item'); | |
newElem.innerHTML = notif.name; | |
container.appendChild(newElem); | |
setTimeout(() => {newElem.remove()}, 800); | |
} |
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