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RubyCalculator.rb
63 lines (55 loc) · 968 Bytes
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RubyCalculator.rb
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# -*- coding: utf-8 -*-
#
# Ruby Calculator v1.1.0
# by gdi2290
#
# MRI Ruby Version: 2.0.0p195
#
# method_missing approach
class Calculator
def initialize
@cal={
add: ->(a,b) { a + b },
subtract: ->(a,b) { a - b },
divide: ->(a,b) { a / b },
multiply: ->(a,b) { a * b },
power: ->(a,b) { a ** b }
}
end
def method_missing(expression, a, b)
@cal[expression].call(a,b)
end
end
# define_method approach
class Calculator
def initialize
cal :add, :+
cal :subtract, :-
cal :divide, :/
cal :multiply, :*
cal :power, :**
end
def cal(name, sym)
Calculator.class_eval do
define_method name, ->(a, b) { a.send(sym, b) }
end
end
end
# basic approach
class Calculator
def add(a, b)
a + b
end
def subtract(a, b)
a - b
end
def divide(a, b)
a / b
end
def muliply(a, b)
a * b
end
def power(a, b)
a ** b
end
end