ユーザー入力をハッシュ値と比較する方法

Question

ユーザー入力とハッシュ値の値を比較しようとしています。

たとえば、IRBで"e".scrabble()を実行した場合、ハッシュの "e"の値が返されます。

ハッシュ内にあるかどうか、ハッシュ内のキーのいずれかと等しいかどうかを調べる方法を知りました。

class String 
    define_method(:scrabble) do 
    value_for_letters = { 
     "A"=> 9,"B" => 2,"C" => 2,"D" => 4,"E" => 12,"F" => 2, 
     "G" => 3, "H" => 2, "I" => 9,"J" => 1, "K" => 1,  
     "L" => 4,"M" => 2,"N" => 6,"O" => 8,"P" => 2,"Q" => 1, 
     "R" => 6,"S" => 4,"T" => 6,"U" => 4,"V" => 2,"W" => 2, 
     "X" => 1,"Y" => 2,"Z" => 1 
    } 

    value_for_letters.keys().==(self.capitalize()) 
    "true" 
    end 
end 

Answer 1

class String 
    LETTER_VALUE_MATCHING = { 
    'A' => 9, 'B' => 2, 'C' => 2, 'D' => 4, 'E' => 12, 
    'F' => 2, 'G' => 3, 'H' => 2, 'I' => 9, 'J' => 1, 
    'K' => 1, 'L' => 4, 'M' => 2, 'N' => 6, 'O' => 8, 
    'P' => 2, 'Q' => 1, 'R' => 6, 'S' => 4, 'T' => 6, 
    'U' => 4, 'V' => 2, 'W' => 2, 'X' => 1, 'Y' => 2, 
    'Z' => 1 
    } 

    def scrabble 
    LETTER_VALUE_MATCHING[self.capitalize] 
    end 
end 

'a'.scrabble 
# => 9 
'-'.scrabble 
# => nil