diff options
Diffstat (limited to 'lib/set.rb')
-rw-r--r-- | lib/set.rb | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/lib/set.rb b/lib/set.rb index 47fcc3efc7..aec22ef4fe 100644 --- a/lib/set.rb +++ b/lib/set.rb @@ -231,6 +231,23 @@ class Set end alias < proper_subset? + # Returns true if the set and the given set have at least one + # element in common. + def intersect?(set) + set.is_a?(Set) or raise ArgumentError, "value must be a set" + if size < set.size + any? { |o| set.include?(o) } + else + set.any? { |o| include?(o) } + end + end + + # Returns true if the set and the given set have no element in + # common. This method is the opposite of +intersect?+. + def disjoint?(set) + !intersect?(set) + end + # Calls the given block once for each element in the set, passing # the element as parameter. Returns an enumerator if no block is # given. |