Ruby Code Snippets #3

Here's a simple Ruby code puzzle for you: if an argument is optional in Ruby, what do you think the result of the method would be if you passed 'nil' to arg2?

def mymethod(arg1, arg2='default')
 arg2
end

Well, (as expected?) if you pass a nil as an argument, then there is something being passed, and hence 'default' won't be passed:

mymethod('foo', nil) #=> nil

And if you passed it just a single argument, here's what it'll look like:

mymethod('foo') #=> 'default'