<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 = []; function build(array=arr, index=0, currentDepth=0) { if(index &gt;= array.length) return; if(currentDepth &gt; depth) { result.push([...array]); return; } const current = array[index]; if(Array.isArray(current)) { build(current, 0, currentDepth+1); } else { result.push(current); } build(array, index+1, currentDepth) } build() return result;}</code></pre>

recursive solution

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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()