module PalindromeHongdou

Constants

VERSION

Public Class Methods

is_palindrome?(str) click to toggle source

# File lib/palindrome_hongdou.rb, line 8
def self.is_palindrome?(str)
  str == str.reverse    
end

is_permutated_palindrome?(str) click to toggle source

# File lib/palindrome_hongdou.rb, line 12
def self.is_permutated_palindrome?(str)
  return true if str == str.reverse

  char_counts = {}

  str.split("").each do |c|
    char_counts[c].nil? ? char_counts[c] = 1 : char_counts[c] += 1
  end

  return true if char_counts.values.count(&:odd?) == 1 && str.length.odd?
  return true if char_counts.values.count(&:odd?) == 0 && str.length.even?
  false
end