2022-convert-1d-array-into-2d-array.js

/**
 * 2022. Convert 1D Array Into 2D Array
 * https://leetcode.com/problems/convert-1d-array-into-2d-array/
 * Difficulty: Easy
 *
 * You are given a 0-indexed 1-dimensional (1D) integer array original, and two integers,
 * m and n. You are tasked with creating a 2-dimensional (2D) array with  m rows and n
 * columns using all the elements from original.
 *
 * The elements from indices 0 to n - 1 (inclusive) of original should form the first row
 * of the constructed 2D array, the elements from indices n to 2 * n - 1 (inclusive) should
 * form the second row of the constructed 2D array, and so on.
 *
 * Return an m x n 2D array constructed according to the above procedure, or an empty 2D array
 * if it is impossible.
 */

/**
 * @param {number[]} original
 * @param {number} m
 * @param {number} n
 * @return {number[][]}
 */
var construct2DArray = function(original, m, n) {
  if (original.length !== m * n) return [];

  const result = [];
  for (let i = 0; i < m; i++) {
    result.push(original.slice(i * n, (i + 1) * n));
  }

  return result;
};