diff options
Diffstat (limited to 'railties/guides')
-rw-r--r-- | railties/guides/source/active_support_core_extensions.textile | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/railties/guides/source/active_support_core_extensions.textile b/railties/guides/source/active_support_core_extensions.textile index 788f528654..3ba840c044 100644 --- a/railties/guides/source/active_support_core_extensions.textile +++ b/railties/guides/source/active_support_core_extensions.textile @@ -442,6 +442,28 @@ require_library_or_gem('mysql') NOTE: Defined in +active_support/core_ext/kernel/requires.rb+. +h4. +in?+ and +either?+ + +The predicate +in?+ tests if an object is included in another object, and the predicate +either?+ tests if an object is included in a list of objects which will be passed as arguments. + +Examples of +in?+: + +<ruby> + 1.in?([1,2]) # => true + "lo".in?("hello") # => true + 25.in?(30..50) # => false +</ruby> + +Examples of +either?+: + +<ruby> + 1.either?(1,2,3) # => true + 5.either?(1,2,3) # => false + [1,2,3].either?([1,2,3], 2, [3,4,5]) # => true +</ruby> + +NOTE: Defined in +active_support/core_ext/object/inclusion.rb+. + h3. Extensions to +Module+ h4. +alias_method_chain+ |