<pre class="shiki github-dark shaku"><code>/*type Callback = (error: Error, data: any) =&gt; voidtype AsyncFunc = ( callback: Callback, data: any) =&gt; void*//** * @param {AsyncFunc[]} funcs * @return {(callback: Callback) =&gt; void} */function race(funcs){ let finished = false; return (finalCb, initialData) =&gt; { funcs.forEach(fn =&gt; { fn(((err, data) =&gt; { if(finished) return; finished = true; finalCb(err, data) }), initialData) }) }}</code></pre>

Simply and lovely

This problem is related to 30. implement async helper - parallel(). You are asked to implement an async function helper, race() which works like Promi…