<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){ // your code here return function(finalCb, initData) { let hasCalled = false; for (let i = 0; i&lt; funcs.length; i++) { funcs[i]((error, data)=&gt;{ if (hasCalled) { return; } if (error) { hasCalled = true; return finalCb(error, undefined); } else { hasCalled = true; return finalCb(undefined, data); } }, initData); } }}</code></pre>

race 异步版本。用一个值标记是否有异步回调被执行

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