A method with an optional parameter

Question

Is there a way to make a method that can accept a parameter, but can also be called without one, in which case the parameter is regarded nil like the following?

Answer 1

You can also use a hash as argument and have more freedom:

def print_arg(args = {})
  if args.has_key?(:age)
    puts args[:age]
  end
end

print_arg 
# => 
print_arg(age: 35, weight: 90)
# => 35