<pre class="shiki github-dark shaku"><code>function all(promises) { const op = []; let promisesToComplete = promises.length; return new Promise((res, rej)=&gt;{ if(!promises.length) res([]); for(let i in promises){ Promise.resolve(promises[i]) .then((data)=&gt;{ op[i] = data; if(!--promisesToComplete) res(op); }) .catch(rej) } })}</code></pre>

Using Promise.resolve and looping over promises

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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…