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AS guide: removes docs for Object#instance_variable_defined?, no longer in AS

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Xavier Noria 2009-11-09 23:38:48 +01:00
parent b5faacb194
commit 7982956013
1 changed files with 0 additions and 26 deletions
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railties/guides/source/active_support_core_extensions.textile
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@ -297,32 +297,6 @@ h4. Instance Variables
Active Support provides several methods to ease access to instance variables.
h5. +instance_variable_defined?+
The method +instance_variable_defined?+ exists in Ruby 1.8.6 and later, and it is defined for previous versions anyway:
<ruby>
class C
def initialize
@a = 1
end
def m
@b = 2
end
end
c = C.new
c.instance_variable_defined?("@a") # => true
c.instance_variable_defined?(:@a) # => true
c.instance_variable_defined?("a") # => NameError: `a' is not allowed as an instance variable name
c.instance_variable_defined?("@b") # => false
c.m
c.instance_variable_defined?("@b") # => true
</ruby>
h5. +instance_variable_names+
Ruby 1.8 and 1.9 have a method called +instance_variables+ that returns the names of the defined instance variables. But they behave differently, in 1.8 it returns strings whereas in 1.9 it returns symbols. Active Support defines +instance_variable_names+ as a portable way to obtain them as strings: