reverse_half_time.rb

def reverse_string(word)
  new_word = []
  array_chars = word.split("")
  last_index = array_chars.length - 1

  0..(array_chars.length/2.00).ceil.times do |i|
    new_word[last_index - i] = array_chars[i]
    new_word[i] = array_chars[last_index - i]
  end

  new_word.join("")
end

reverseHalfTime.js

function reverseString(word) {
  const new_word = [];
  const array_chars = word.split("");
  const last_index = array_chars.length - 1;
  
  for (let i = 0; i <= Math.ceil(array_chars.length/2); i++) {
    new_word[last_index - i] = array_chars[i];
    new_word[i] = array_chars[last_index - i]
  }
  
  return new_word.join("");
}