class StringCalculator
Public Class Methods
new(value = 0)
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# File lib/calculator/string_calculator.rb, line 5 def initialize(value = 0) @value = value end
Public Instance Methods
add(string)
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# File lib/calculator/string_calculator.rb, line 13 def add(string) check_negatives(string) @value += sum_ints(string) self end
check_negatives(string)
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# File lib/calculator/string_calculator.rb, line 29 def check_negatives(string) negs = ints(string).select { |i| i<0 } raise "Negatives not allowed! #{negs.join(', ')}" if negs.any? self end
subtract(string)
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# File lib/calculator/string_calculator.rb, line 24 def subtract(string) @value -= sum_ints(string) self end
sum_ints(string)
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# File lib/calculator/string_calculator.rb, line 19 def sum_ints(string) ints(string).inject(:+) end
value()
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# File lib/calculator/string_calculator.rb, line 9 def value @value end