@virtualstate/union/lib/examples/couple-generators.js

Concurrent union

import { union } from "../union.js";
async function doTask(maxInterval = 1000) {
    // Do some task for given time
    const taskTime = Math.round(Math.random() * maxInterval);
    console.log({ taskTime, maxInterval });
    await new Promise(resolve => setTimeout(resolve, taskTime));
    // if (Math.random() > 0.5) {
    //   throw new Error("Hey, this is an error!");
    // }
}
async function* doTasks(maxCount = 100, task) {
    let tasksRemaining = 1 + Math.floor(Math.random() * maxCount);
    console.log("Tasks", tasksRemaining);
    do {
        tasksRemaining -= 1;
        const start = Date.now();
        console.log("start task");
        await task();
        console.log("complete task");
        const complete = Date.now();
        const taskTime = complete - start;
        yield [tasksRemaining, taskTime];
    } while (tasksRemaining > 0);
}
async function* primary() {
    yield* doTasks(5, myPrimaryTask);
    async function myPrimaryTask() {
        await doTask(250);
    }
}
async function* secondary() {
    yield* doTasks(5, mySecondaryTask);
    async function mySecondaryTask() {
        await doTask(250);
    }
}
try {
    for await (const slice of union([primary(), secondary()])) {
        console.log({ slice });
    }
    console.log("Complete");
}
catch (error) {
    console.error({ error });
}
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