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Contents
module BookKeeping
VERSION = 1
end
class WordProblem
attr_reader :question
def initialize(question)
@question = question
end
def answer
if too_complicated?
fail ArgumentError.new("I don't understand the question")
end
unless @answer
@answer = n1.send(operation(2), n2)
@answer = @answer.send(operation(5), n3) if chain?
end
@answer
end
private
def too_complicated?
matches.nil?
end
def matches
@matches ||= question.match(pattern)
end
def pattern
operations = '(plus|minus|multiplied by|divided by)'
/What is (-?\d+) #{operations} (-?\d+)( #{operations} (-?\d+))?\?/
end
def operation(index)
case matches[index]
when 'plus' then :+
when 'minus' then :-
when 'multiplied by' then :*
when 'divided by' then :/
end
end
def n1
matches[1].to_i
end
def n2
matches[3].to_i
end
def n3
matches[6].to_i
end
def chain?
!!matches[4]
end
end
Version data entries
346 entries across 346 versions & 1 rubygems