Edx Class 169.1x HW 1-6

Advanced_oop_2.rb

class Numeric
    @@currencies = {'yen' => 0.013, 'euro' => 1.292, 'rupee' => 0.019, 'dollar' => 1}
    
    def method_missing(method_id)
        singular_currency = method_id.to_s.gsub( /s$/, '')
        @src_currency = singular_currency
        if @@currencies.has_key?(singular_currency)
            self * @@currencies[singular_currency]
        else
            super
        end
    end

    def in(dst_currency)
        (1 / @@currencies[dst_currency.to_s.gsub( /s$/, '')]) * self
    end
end

class String
    def palindrome?
        tmp_str = self.downcase.gsub(/[^a-z]/,'')
        tmp_str.reverse == tmp_str
    end
end

module Enumerable
    def palindrome?
        self == self.reverse
    rescue NoMethodError
        self.to_a == self.to_a.reverse
    end
end