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author | Xavier Noria <fxn@hashref.com> | 2010-07-28 03:49:04 +0200 |
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committer | Xavier Noria <fxn@hashref.com> | 2010-07-28 03:49:04 +0200 |
commit | e17e08efef68e9865cfbd5c0155b3d9734339192 (patch) | |
tree | 89cb96a7d2c6a3c152af9fdbbd1b58e1334eaa28 /railties/guides | |
parent | 5d3e8ee2bdd2225fe6e610c7e465bb69234871ed (diff) | |
download | rails-e17e08efef68e9865cfbd5c0155b3d9734339192.tar.gz rails-e17e08efef68e9865cfbd5c0155b3d9734339192.tar.bz2 rails-e17e08efef68e9865cfbd5c0155b3d9734339192.zip |
adds test coverage for edge-cases of Array.wrap, and better documentation for how it differs from Kernel#Array
Diffstat (limited to 'railties/guides')
-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 d14a531abe..fc59df9fe4 100644 --- a/railties/guides/source/active_support_core_extensions.textile +++ b/railties/guides/source/active_support_core_extensions.textile @@ -2229,7 +2229,14 @@ 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}] |