Day-22 (2625. Flatten Deeply Nested Array).js

/**
 * @param {any[]} arr
 * @param {number} depth
 * @return {any[]}
 */
var flat = function (arr, n) {
    let res = [];
    const flattening = (nums, l) => {
        for(const num of nums) {
            if(Array.isArray(num) && l > 0 && l <= n){
                flattening(num, l-1);
            } else {
                res.push(num);
            }
        }
    }
    flattening(arr, n);
    return res;
};