<pre class="shiki github-dark shaku"><code>/** * @param {() =&gt; Promise&lt;any&gt;} func * @param {number} max * @return {Promise} */function throttlePromises(funcs, max){ function partialCall () { let promise = Promise.resolve([]); return promise.then(function fetchPartial (data) { if (!funcs.length) { return data; } const toCall = funcs.splice(0, max); return Promise.all(toCall.map(func =&gt; func())).then(result =&gt; fetchPartial([...data, ...result])) }) } return partialCall(); }</code></pre>

This is my accepted solution (Promise api only)

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Say you need to fetch some data through 100 APIs, and as soon as possible. If you use Promise.all(), 100 requests go to your server at the same time, …