<pre class="language-javascript"><code class="language-javascript">
/**
 * @param {Array&lt;any&gt;} promises - notice input might have non-Promises
 * @return {Promise&lt;any[]&gt;}
 */
function all(promises) {
 if (promises.length === 0) {
 return Promise.resolve([])
 }
 let resolvedCount = 0, result = [];
 return new Promise((resolve, reject) =&gt; {
 for (let i = 0; i &lt; promises.length; i++) {
 Promise.resolve(promises[i]).then((data) =&gt; {
 resolvedCount++;
 result[i] = data;
 if (resolvedCount === promises.length) {
 resolve(result);
 }
 }).catch(error =&gt; reject(error));
 }
 })
}</code></pre>

Easy solution

> The Promise.all() method takes an iterable of promises as an input, and returns a single Promise that resolves to an array of the results of the inp…

33. implement `Promise.allSettled()`

33. `Promise.allSettled()`を実装する

33. 实现`Promise.allSettled()`

31. implement async helper - `race()`

31. async helper - `race()`を実装する

31. 实现async helper - `race()`

32. implement `Promise.all()`

32. `Promise.all()`を実装する

32. 实现`Promise.all()`