```js const arr1 = [1, [2, [3, [4, 5]]]] const extract = arr => { return arr.reduce((p, c) => Array.isArray(c) ? [...p, ...extract(c)] : [...p, c], []) } const recover = (ori, target) => { return ori.map(el => Array.isArray(el) ? recover(el, target) : target.pop()) } const solution = (arr) => recover(arr, extract(arr)) console.log(JSON.stringify(solution(arr1))); ```
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