@virtualstate/union/lib/examples/reuse.js

Concurrent union

import { union } from "../union.js";
import { setReuse } from "../reuse.js";
async function* generatorOne() {
    let remaining = 10;
    while (remaining >= 0) {
        await new Promise((resolve) => setTimeout(resolve, 500));
        yield remaining;
        remaining -= 1;
    }
}
async function* generatorTwo() {
    let remaining = 10;
    while (remaining <= 20) {
        await new Promise((resolve) => setTimeout(resolve, 500));
        yield remaining;
        remaining += 1;
    }
}
async function run() {
    const basicOne = generatorOne();
    const basicTwo = generatorTwo();
    for await (const result of union([
        basicOne,
        basicOne,
        basicTwo,
        basicOne,
        basicOne,
        basicOne,
        basicTwo
    ], { reuseInFlight: true })) {
        console.log(result.join(","));
    }
    const brandedOne = generatorOne();
    setReuse(brandedOne);
    const brandedTwo = generatorTwo();
    setReuse(brandedTwo);
    for await (const result of union([
        brandedOne,
        brandedOne,
        brandedTwo,
        brandedOne,
        brandedOne,
        brandedOne,
        brandedTwo
    ])) {
        console.log(result.join(","));
    }
}
run().catch(console.error);
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