<pre class="shiki github-dark shaku"><code>/** * @param { (...args: any[]) =&gt; any } fn * @returns { (...args: any[]) =&gt; any } */function curry(fn) { // your code here return function curried(...args) { const checkArgs = args.some(x =&gt; x === curry.placeholder); if (!checkArgs &amp;&amp; args.length &gt;= fn.length) { return fn.apply(this, args); } return (...newArgs) =&gt; { for (let i = 0; i &lt; args.length; i++) { if (args[i] === curry.placeholder) { const newArg = newArgs.shift(); if(newArg !== curry.placeholder){ args[i] = newArg; } } } return curried.apply(this, [...args, ...newArgs]); } }}curry.placeholder = Symbol()</code></pre>

This is my accepted solution

This is a follow-up on 1. implement curry() please implement curry() which also supports placeholder. Here is an example const join = (a, b, c) => { r…