second-largest-number.js

/**
 *
 * Date: 08/03/2022
 * Task-06: Get second largest number from array
 * Author: Ali Raza (ali.dev@pk.see.biz)
 *
 */

/**
 *
 * @param {Array} inputArray
 * @returns {Number} - Second largest number in the given array
 */
function secondLargestNumber(inputArray) {
  // There can't be a second element if array length isn't 2
  if (inputArray.length < 2) {
    return false;
  }

  // Check if all the elements are valid numbers
  if(inputArray.find((el) => !Number.isInteger(el))) return "Please provide a valid numbers array.";

  // Sort the array in ascending order
  const sorted = inputArray.sort((a, b) => a - b);

  // Return the second last element
  return sorted.at(-2);
}