asyncparallel.js

const asyncOk = async () => {
    return new Promise(re => setTimeout(re, 0))
}
const asyncFail = async () => {
    return new Promise((_, re) => setTimeout(() => re(Error()), 0))
}

const run1 = async () => {
    try {
        const [a, b] = [asyncFail(), asyncOk()]
        console.log(await a, await b)
    } catch (e) {
        console.error(e)
    }
}

run1() // catches error


const run2 = async () => {
    try {
        const [a, b] = [asyncFail(), asyncFail()]
        console.log(await a, await b)
    } catch (e) {
        console.error(e)
    }
}

run2() // triggers unhandledRejection