コーディングチャレンジ（随時更新）

Palindrome

Palindrome は逆さにしても同じ文字列のこと

Using the Ruby language, have the function PalindromeTwo(str) take the str parameter being passed and return the string true if the parameter is a palindrome, (the string is the same forward as it is backward) otherwise return the string false. The parameter entered may have punctuation and symbols but they should not affect whether the string is in fact a palindrome. For example: "Anne, I vote more cars race Rome-to-Vienna" should return true. Use the Parameter Testing feature in the box below to test your code with different arguments..

Palindrome #　== 逆さにしても同じ文字列

def PalindromeTwo(str) 
  arr = str.scan(/\w+/).join.downcase 
  arr.reverse == arr 
end

http://coderbyte.com/CodingArea/Editor.php?ct=Palindrome%20Two&lan=Ruby

Binary digits 

２進数から１０進数への変換

2進数と10進数と16進数｜相互比較と変換

Using the Ruby language, have the function BinaryConverter(str) return the decimal form of the binary value. For example: if 101 is passed return 5, or if 1000 is passed return 8. 

Use the Parameter Testing feature in the box below to test your code with different arguments.

Binary digits #　== ２進数　=> 10進数

def BinaryConverter(str)
  arr = str.split("")
  new_arr = []
  index = (0..(arr.length-1)).to_a.reverse
  arr.each_with_index do |n, i|
    new_arr << 2 ** index[i] * n.to_i
  end
  return new_arr.inject(:+) 
end

http://coderbyte.com/CodingArea/Editor.php?ct=Binary%20Converter&lan=Ruby