And a video explaining <a href="https://www.youtube.com/watch?v=z0Jl-UUPtEw">https://www.youtube.com/watch?v=z0Jl-UUPtEw</a>
<pre class="shiki github-dark shaku"><code>/** * @param {Array} arr * @param {number} depth */function flat(arr, depth = 1) { const result = [] const stack = [...arr.map(item =&gt; ([item, depth]))] while (stack.length &gt; 0) { const [top, depth] = stack.pop() if (Array.isArray(top) &amp;&amp; depth &gt; 0) { stack.push(...top.map(item =&gt; ([item, depth - 1]))) } else { result.push(top) } } return result.reverse()}</code></pre>

iteration approach

TikTok

Google

Apple

Yandex

Roblox

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()