diff options
Diffstat (limited to 'lib/prime.rb')
-rw-r--r-- | lib/prime.rb | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/prime.rb b/lib/prime.rb index d99a51a967..c79b0cfd5f 100644 --- a/lib/prime.rb +++ b/lib/prime.rb @@ -144,6 +144,8 @@ class Prime # +value+:: an arbitrary integer to be checked. # +generator+:: optional. A pseudo-prime generator. def prime?(value, generator = Prime::Generator23.new) + raise ArgumentError, "Expected a prime generator, got #{generator}" unless generator.respond_to? :each + raise ArgumentError, "Expected an integer, got #{value}" unless value.respond_to?(:integer?) && value.integer? return false if value < 2 generator.each do |num| q,r = value.divmod num |