Created
September 2, 2014 20:34
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Vanity phone number converter
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# Converts a phone number with letters to a phone number with only numbers. | |
# Leaves any other characters untouched. | |
class VanityPhoneNumberConverter | |
LETTER_TO_NUMBER = { | |
'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' | |
} | |
attr_accessor :phone_number | |
def initialize(phone_number) | |
@phone_number = phone_number | |
end | |
def convert | |
result = "" | |
@phone_number.each_char do |c| | |
result << (LETTER_TO_NUMBER[c.downcase] || c) | |
end | |
result | |
end | |
def self.convert(markdown) | |
self.new(markdown).convert | |
end | |
end |
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