2625. Flatten Deeply Nested Array

https://leetcode.com/problems/flatten-deeply-nested-array/

Javascript

var flat = function (arr, n) {
    function* liter(item, level) {
        if (!Array.isArray(item)) {
            yield item
        } else  if (level < 0) {
            yield item
        }  else {
            for (const child of item) {
                for (const subItem of liter(child, level-1)) {
                    yield subItem
                }
            }
        }
    }

    return Array.from(liter(arr, n))
};

Typescript

type MultiDimensionalArray = (number | MultiDimensionalArray)[];

var flat = function (arr:  MultiDimensionalArray, n: number):  MultiDimensionalArray {
   function* liter(item, level) {
        if (!Array.isArray(item)) {
            yield item
        } else  if (level < 0) {
            yield item
        }  else {
            for (const child of item) {
                for (const subItem of liter(child, level-1)) {
                    yield subItem
                }
            }
        }
    }

    return Array.from(liter(arr, n)) 
};