Iterable Observer

Iterable Observer

Observable Proposal implement based on Async Generator (ES 2018) & TypeScript

NPM Dependency CI & CD

NPM

Usage

Basic

import { Observable } from 'iterable-observer';

var count = 0,
list = [];

const observable = new Observable(({ next, complete }) => {
const timer = setInterval(
() => (++count < 5 ? next(count) : complete(count)),
0
);

return () => clearInterval(timer);
});

(async () => {
for await (const item of observable) list.push(item);

console.log(list); // [1, 2, 3, 4, 5]
})();

Enhance Run-time platforms

import { Observable } from 'iterable-observer';

const reader = new FileReader(),
{
files: [file]
} = document.querySelector('input[type="file"]');

reader.readAsBlob(file);

(async () => {
for await (const { loaded } of Observable.fromEvent(reader, 'progress'))
console.log((loaded / file.size) * 100 + '%');
})();

Concurrent Task to Serial Queue

import { createQueue } from 'iterable-observer';
import Koa from 'koa';
import BodyParser from 'koa-bodyparser';

const { process, observable } = createQueue(),
app = new Koa();

(async () => {
for await (const {
defer: { resolve },
data
} of observable)
resolve(JSON.stringify(data));
})();

app.use(BodyParser)
.use(async context => (context.body = await process(context.request.body)))
.listen(80);

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