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c2d23aff
编写于
1月 07, 2009
作者:
J
Jeremy Kemper
提交者:
Yehuda Katz
1月 09, 2009
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差异文件
Object#tap for Ruby < 1.8.7
上级
b1530545
变更
3
隐藏空白更改
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Showing
3 changed file
with
26 addition
and
0 deletion
+26
-0
activesupport/CHANGELOG
activesupport/CHANGELOG
+3
-0
activesupport/lib/active_support/core_ext/object/misc.rb
activesupport/lib/active_support/core_ext/object/misc.rb
+15
-0
activesupport/test/core_ext/object_ext_test.rb
activesupport/test/core_ext/object_ext_test.rb
+8
-0
未找到文件。
activesupport/CHANGELOG
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*2.3.0 [Edge]*
* Object#tap shim for Ruby < 1.8.7. Similar to Object#returning, tap yields self then returns self. [Jeremy Kemper]
array.select { ... }.tap(&:inspect).map { ... }
* TimeWithZone#- gives correct result with wrapped DateTime, and with DateTime argument [Geoff Buesing]
* Updated i18n gem to version 0.1.1 #1635 [Yaroslav Markin]
...
...
activesupport/lib/active_support/core_ext/object/misc.rb
浏览文件 @
c2d23aff
...
...
@@ -40,6 +40,21 @@ def returning(value)
value
end
# Yields <code>x</code> to the block, and then returns <code>x</code>.
# The primary purpose of this method is to "tap into" a method chain,
# in order to perform operations on intermediate results within the chain.
#
# (1..10).tap { |x| puts "original: #{x.inspect}" }.to_a.
# tap { |x| puts "array: #{x.inspect}" }.
# select { |x| x%2 == 0 }.
# tap { |x| puts "evens: #{x.inspect}" }.
# map { |x| x*x }.
# tap { |x| puts "squares: #{x.inspect}" }
def
tap
yield
self
self
end
unless
Object
.
respond_to?
(
:tap
)
# An elegant way to factor duplication out of options passed to a series of
# method calls. Each method called in the block, with the block variable as
# the receiver, will have its options merged with the default +options+ hash
...
...
activesupport/test/core_ext/object_ext_test.rb
0 → 100644
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c2d23aff
require
'abstract_unit'
class
ObjectExtTest
<
Test
::
Unit
::
TestCase
def
test_tap_yields_and_returns_self
foo
=
Object
.
new
assert_equal
foo
,
foo
.
tap
{
|
x
|
assert_equal
foo
,
x
;
:bar
}
end
end
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