Can I tell a Ruby method to expect a specific parameter type?

Question

def doSomething(value)
    if (value.is_a?(Integer))
        print value * 2
    else
        print \"Error: Expected integer value\"
        exit
    end
end
         


        

Answer 1

I would suggest a raise unless type match at the beginning of the method

def do_something(value)
  raise TypeError, 'do_something expects an integer' unless value.kind_of?(Integer)
  ...
end

This is raise an error and exit unless value is an Integer