<pre class="shiki github-dark shaku"><code>/** * @param {() =&gt; Promise&lt;any&gt;} func * @param {number} max * @return {Promise} */function throttlePromises(funcs, max) { const results = new Array(funcs.length) let next = 0 let done = 0 return new Promise((resolve, reject) =&gt; { if (funcs.length === 0) { resolve(results) return } function worker() { if (next &gt;= funcs.length) return const index = next++ Promise.resolve(funcs[index]()).then((res) =&gt; { results[index] = res done++ if (done === funcs.length) resolve(results) else worker() }).catch(reject) } for (let i = 0; i &lt; Math.min(max, funcs.length); i++) { worker() } })}</code></pre>

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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, …