diff options
Diffstat (limited to 'railties/guides/source')
| -rw-r--r-- | railties/guides/source/active_support_core_extensions.textile | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/railties/guides/source/active_support_core_extensions.textile b/railties/guides/source/active_support_core_extensions.textile index 6ee7a4220b..fcf4ae29ba 100644 --- a/railties/guides/source/active_support_core_extensions.textile +++ b/railties/guides/source/active_support_core_extensions.textile @@ -2214,7 +2214,14 @@ NOTE: Defined in +active_support/core_ext/array/conversions.rb+. h4. Wrapping -The class method +Array.wrap+ behaves like the function +Array()+ except that it does not try to call +to_a+ on its argument. That changes the behavior for enumerables: +The class method +Array.wrap+ behaves like the function +Array()+ except: + +* If the argument responds to +to_ary+ the method is invoked. <tt>Kernel#Array</tt> moves on to try +to_a+ if the returned value is +nil+, but <tt>Arraw.wrap</tt> returns such a +nil+ right away. +* If the returned value from +to_ary+ is neither +nil+ nor an +Array+ object, <tt>Kernel#Array</tt> raises an exception, while <tt>Array.wrap</tt> does not, it just returns the value. +* It does not call +to_a+ on the argument, though special-cases +nil+ to return an empty array. + + + that it does not try to call +to_a+ on its argument. That changes the behavior for enumerables: <ruby> Array.wrap(:foo => :bar) # => [{:foo => :bar}] |