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| author | Xavier Noria <fxn@hashref.com> | 2009-07-12 01:58:28 +0200 |
|---|---|---|
| committer | Xavier Noria <fxn@hashref.com> | 2009-07-12 01:58:28 +0200 |
| commit | ae44ed59082d7d2c7db32dd93611a16a41c84e13 (patch) | |
| tree | df4a5ba4cefc0e14d157a36575e5f8218ed4f1fc /railties/guides/source/active_support_overview.textile | |
| parent | ee7487e46abbdf195f398922d5b05dc1f5b5d08f (diff) | |
| download | rails-ae44ed59082d7d2c7db32dd93611a16a41c84e13.tar.gz rails-ae44ed59082d7d2c7db32dd93611a16a41c84e13.tar.bz2 rails-ae44ed59082d7d2c7db32dd93611a16a41c84e13.zip | |
AS guide: explains Object#tap
Diffstat (limited to 'railties/guides/source/active_support_overview.textile')
| -rw-r--r-- | railties/guides/source/active_support_overview.textile | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/railties/guides/source/active_support_overview.textile b/railties/guides/source/active_support_overview.textile index 2248ba33c3..e7751b32b1 100644 --- a/railties/guides/source/active_support_overview.textile +++ b/railties/guides/source/active_support_overview.textile @@ -84,6 +84,24 @@ By definition all objects are +duplicable?+ except +nil+, +false+, +true+, symbo WARNING. Using +duplicable?+ is discouraged because it depends on a hard-coded list. Classes have means to disallow duplication like removing +dup+ and +clone+ or raising exceptions from them, only +rescue+ can tell. +h4. +tap+ + ++Object#tap+ exists in Ruby 1.8.7 and 1.9, and it is defined by Active Support for previous versions. This method yields its receiver to a block and returns it. + +For example, the following class method from +ActionDispatch::TestResponse+ creates, initializes, and returns a new test response using +tap+: + +<ruby> +def self.from_response(response) + new.tap do |resp| + resp.status = response.status + resp.headers = response.headers + resp.body = response.body + end +end +</ruby> + +See also +Object#returning+ in "Extensions to All Objects FIX THIS LINK":FIXME. + h4. +metaclass+ |