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Solution: Convert Word to Phone Number

Explore how to convert words into phone numbers using Ruby by mapping characters to keypad numbers. This lesson teaches you to implement a hash for uppercase character conversion, enhancing your ability to create practical utility programs in Ruby.

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Solution

Ruby 3.1.2
phone_num_lookup = {"A" => 2, "B" => 2, "C" => 2, 
                    "D" => 3, "E" => 3, "F" => 3, 
                    "G"=> 4, "H"=> 4, "I"=> 4, 
                    "J"=> 5, "K"=> 5, "L"=> 5, 
                    "M"=> 6, "N"=> 6, "O"=> 6, 
                    "P"=> 7, "Q"=> 7, "R"=> 7, "S"=> 7, 
                    "T"=> 8, "U"=> 8, "V"=> 8, 
                    "W"=> 9, "X"=> 9, "Y"=> 9, "Z"=> 9}
digits = phone_word.upcase.split("")
numbers = []
digits.each do |digit|    
  numbers << phone_num_lookup[digit]
end
phone_num = numbers.join

Explanation

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