<pre class="shiki github-dark shaku"><code>/** * @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

TikTok

Lyft

Snap

> 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…