<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) { return new Promise((resolve, reject) =&gt; { if (!promises.length) { resolve(promises); } const results = []; const isResolved = new Array(promises.length).fill(false); for (let i = 0; i &lt; promises.length; i++) { const promise = promises[i]; if (!promise.then) { // value not a promise results[i] = promise; isResolved[i] = true; if (!isResolved.includes(false)) { resolve(results); } continue; } promise .then(res =&gt; { isResolved[i] = true; results[i] = res; if (!isResolved.includes(false)) { resolve(results); } }) .catch(err =&gt; reject(err)); }; });}const printSomething1 = new Promise((res, rej) =&gt; setTimeout(() =&gt; res(1), 1000));const printSomething2 = new Promise((res, rej) =&gt; setTimeout(() =&gt; res(2), 2000));const printSomething3 = new Promise((res, rej) =&gt; setTimeout(() =&gt; res(3), 3000));const results = all([1, 2, Promise.resolve(1)]).then(res =&gt; console.log(res)).catch(err =&gt; console.log(err))</code></pre>

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> 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…