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* NEWS: [DOC] In the new safe call syntax, arguments are evaluated

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only if a call is made.

* doc/syntax/calling_methods.rdoc: Fix a typo.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52251 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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knu 2015-10-23 16:53:41 +00:00
parent 4daa1cf730
commit 1b5dce5a4e
3 changed files with 12 additions and 2 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
Sat Oct 24 01:51:01 2015 Akinori MUSHA <knu@iDaemons.org>
* NEWS: [DOC] In the new safe call syntax, arguments are evaluated
only if a call is made.
* doc/syntax/calling_methods.rdoc: Fix a typo.
Sat Oct 24 00:38:34 2015 Shugo Maeda <shugo@ruby-lang.org>
* lib/forwardable (def_instance_delegator, def_single_delegator):

5
NEWS
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@ -22,10 +22,13 @@ with all sufficient information, see the ChangeLog file.
* new method call syntax, `object.?foo', method #foo is called on
`object' if it is not nil.
this is similar to `try!' in Active Support, except for:
this is similar to `try!' in Active Support, except:
* method name is syntactically required
obj.try! {} # valid
obj.? {} # syntax error
* arguments are evaluated only if a call is made:
obj.try!(:foo, bar()) # bar() is always evaluated
obj.?foo(bar()) # bar() is conditionally evaluated
* attribute assignment is valid
obj.?attr += 1

2
doc/syntax/calling_methods.rdoc
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@ -29,7 +29,7 @@ NoMethodError.
You may use <code>.?</code> to designate a receiver, then +my_method+ is not
invoked and the result is +nil+ when the receiver is +nil+. In that case, the
argument of +my_method+ are not evaluated.
arguments of +my_method+ are not evaluated.
You may also use <code>::</code> to designate a receiver, but this is rarely
used due to the potential for confusion with <code>::</code> for namespaces.