<pre class="shiki github-dark shaku"><code>// This is a JavaScript coding problem from BFE.dev /** * @param { Array } arr * @param { number } depth * @returns { Array } */function flat(arr, depth = 1) { // your imeplementation here const result = []; arr.forEach((item) =&gt; { if(Array.isArray(item) &amp;&amp; depth) { result.push(...flat(item, depth - 1)) } else { result.push(item) } }); return result;}</code></pre>

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There is already Array.prototype.flat() in JavaScript (ES2019), which reduces the nesting of Array. Please implement your own. const arr = [1, [2], [3…

implement it by yourself

4. implement basic throttle()

2. implement curry() with placeholder support

3. implement Array.prototype.flat()