<pre class="shiki github-dark shaku"><code>/** * @param { Array } arr * @param { number } depth * @returns { Array } */function flat(arr, depth = 1) { // your imeplementation here let newArr=[]; if(depth===-1){ return [arr] } for(let a of arr){ if(Array.isArray(a)){ newArr.push(...flat(a,depth-1)) } else{ newArr.push(a) } } return newArr;}</code></pre>

Recursion Approach

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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()