How do I get the second largest element from an array in javascript [closed]

Answer 1

The most straightforward implementation, without modifying the original array, is to iterate and track the biggest and next biggest:

function nextBiggest(arr) {
  let max = -Infinity, result = -Infinity;

  for (const value of arr) {
    const nr = Number(value)

    if (nr > max) {
      [result, max] = [max, nr] // save previous max
    } else if (nr < max && nr > result) {
      result = nr; // new second biggest
    }
  }

  return result;
}

const arr = ['20','120','111','215','54','78'];
console.log(nextBiggest(arr));