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Phone Example
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class PhoneNumber | |
attr_reader :number | |
def initialize(number) | |
@number = clean(number) | |
end | |
def area_code | |
number[0..2] | |
end | |
# technically, the central office (exchange) code | |
def exchange_code | |
number[3..5] | |
end | |
def subscriber_number | |
number[6..9] | |
end | |
def to_s | |
"(#{area_code}) #{exchange_code}-#{subscriber_number}" | |
end | |
private | |
def clean(number) | |
number = number.gsub(/[^0-9]/, "") | |
normalize(number) | |
end | |
def normalize(number) | |
if valid?(number) | |
number[/(\d{10})\z/, 1] | |
else | |
"0" * 10 | |
end | |
end | |
def valid?(number) | |
return true if number.length == 10 | |
return true if number.length == 11 && number.start_with?("1") | |
false | |
end | |
end |
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