2625-flatten-deeply-nested-array.ts

// Title: Flatten Deeply Nested Array
// Description:
//     Given a multi-dimensional array arr and a depth n, return a flattened version of that array.
//     A multi-dimensional array is a recursive data structure that contains integers or other multi-dimensional arrays.
//     A flattened array is a version of that array with some or all of the sub-arrays removed and replaced with the actual elements in that sub-array.
//     This flattening operation should only be done if the current depth of nesting is less than n.
//     The depth of the elements in the first array are considered to be 0.
//     Please solve it without the built-in Array.flat method.
// Link: https://leetcode.com/problems/flatten-deeply-nested-array/

type MultiDimensionalArray = (number | MultiDimensionalArray)[];

function flat(arr: MultiDimensionalArray, n: number): MultiDimensionalArray {
  return n > 0 ? arr.flatMap((e) => Array.isArray(e) ? flat(e, n-1) : e) : arr;
}