Understanding promise.race() usage

Question

As far as I know, there are two options about promise:

• promise.all()

• promise.race()

Ok, I know what promise.all()<

Answer 1

Let's take an sample workaround of Promise.race like below.

const race = (promises) => {
    return new Promise((resolve, reject) => {
        return promises.forEach(f => f.then(resolve).catch(reject));
    })
};

You can see race function executes all promises, but whomever finishes first will resolve/reject with wrapper Promise.