<pre class="shiki github-dark shaku"><code>/** * @param {Array&lt;Promise&gt;} promises * @return {Promise} */function race(promises) { // your code here return new Promise((resolve, reject) =&gt; { for (let i = 0;i&lt;promises.length;i++) { Promise.resolve(promises[i]).then((val) =&gt; { resolve(val); }).catch((reason) =&gt; { reject(reason); }) } })}</code></pre>

感觉是这一系列最简单的。遍历所有promise，注意包装非promise值，有一个resolve则立即resolve，有一个reject立即reject。

Yandex

This problem is similar to 31. implement async helper - race(), but with Promise. > The Promise.race() method returns a promise that fulfills or rejec…