SOURCE

Promise.myRace = function (iterable) {
    return new Promise((resolve, reject) => {
        let ret
        for (let promise of iterable) {
            Promise.resolve(promise).then((resolved) => {
                if (ret === undefined) {
                    ret = resolved
                    resolve(resolved)
                }
            }).catch((e) => {
                if (ret === undefined) {
                    ret = e
                    reject(e)
                }
            })
        }
    })
}

const promise1 = new Promise((resolve, reject) => {
  setTimeout(reject, 500, 'one');
});

const promise2 = new Promise((resolve, reject) => {
  setTimeout(resolve, 1000, 'two');
});

Promise.myRace([promise1, promise2]).then((data) => {
    console.log(data)
}).catch(e => console.log(e))