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

Besides the more obvious option of parameters with default values, that Sawa has already shown, using arrays or hashes might be handy in some cases. Both solutions preserve nil as a an argument.

1. Receive as array:

def some_func(*args)
  puts args.count
end

some_func("x", nil)
# 2

2. Send and receive as hash:

def some_func(**args)
  puts args.count
end

some_func(a: "x", b: nil)
# 2