Hi,

I've been working through the ruby classes, all very fine stuff

I think this example (taken directly from the course) is taking the refactoring too far (hint: I'm looking at the two "n must be ... " lines)

require 'prime'

def first_n_primes(n)

# Check for correct input!

"n must be an integer" unless n.is_a? Integer

"n must be greater than 0" if n <= 0# The Ruby 1.9 Prime class makes the array automatically!

prime = Prime.instance

prime.first n

end

when called thus:

first_n_primes(-10)

the code just hangs (or presumably tries to find the first -10 primes .

When I add back the "return" statements before "n must be ... " then it works as expected.