7. Reverse Integer

Given a 32-bit signed integer, reverse digits of an integer.

Example 1:

Input: 123
Output: 321

Example 2:

Input: -123
Output: -321

Example 3:

Input: 120
Output: 21

Note: Assume we are dealing with an environment which could only store integers within the 32-bit signed integer range: [−231, 231 − 1]. For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.

# @param {Integer} x
# @return {Integer}
def reverse(x)
  new_a = x.to_s.reverse.to_i
  
  if x >= 0
    new_a < (2**31 - 1) ? new_a : 0
  else
    -new_a > (-2)**31 ? -new_a : 0
  end
  
end