var stringToReverse = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890';
function reverseString1 (str) {
  return str.split('').reverse().join('')
}

function reverseString2(str) {
  let reversed = '';
  for (const character of str) {
    reversed = character + reversed
  }
  return reversed
}

function reverseString3(str) {
  return str.split('').reduce((reversed, character) => character + reversed, '')
}

function reverseString4(str) {
  return [...str].reverse().join('')
}