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Listing of standard methods
More Classes and Objects example from a Well House Consultants training course
More on More Classes and Objects [link]

This example is described in the following article(s):
   • Standard methods available on all objects in Ruby - [link]

Source code: stanley Module: R108
# List of standard methods, and some examples of their use.

class Thing
        end

widget = Thing.new
can_do = widget.methods

for explain in can_do
        p explain
end

# Some testing examples

widget.display
print "\n"
puts widget.inspect

p widget.to_a

__END__

Sample outputs from that end section

#<Thing:0x10b13e140>
#<Thing:0x10b13e140>
stanley:18: warning: default `to_a' will be obsolete
[#<Thing:0x10b13e140>]

Standard methods - In Alphabetic order:

"==" - equality / same value
"===" - equality test for case
"=~" - looks like (regular expression)
"__id__" - give me a unique object no.
"__send__"
"class" - what type of object is this? (Yuk!)
"clone" - duplicate object contents (shallow copy?)
"display" - same as to_s but NOT overridden when you override to_s
"dup" - ?? Deep copy
"enum_for"
"eql?" - test for identical object
"equal?" - test for one and the same object
"extend"
"freeze" - makes it read-only from now on (prevents modification)
"frozen?" - Checks if proven
"hash"
"id"
"inspect" - like "p" but returns string, doesn't output it
"instance_eval"
"instance_exec"
"instance_of?" - check object type (give class name)
"instance_variable_defined?"
"instance_variable_get"
"instance_variable_set"
"instance_variables"
"is_a?" - check object type (unlike class uses inheritance)
                  Often better that "class" or "instance_of?"
"kind_of?" - same as is_a?
"method" - returns a method object
"methods" - Array of methods
"nil?" - does it point to the nil (false) object?
"object_id"
"private_methods" - selectively lists only private methods
"protected_methods"
"public_methods"
"respond_to?" - check whether a method is there somewhere in the inheritance tree
"send" - call a method named as parameter
                thing.send(:setage,25) is equivalent to thing.setage(25)
"singleton_methods" - listing extra methods that apply to this object only
"taint" - mark as "dirty" (so can't be used to open file, for example)
"tainted?" - is it dirty?
"tap" - new in Ruby 1.9; act on object in block but also return object
                avoids breaking a pipeline
"to_a" - to array
                [default is deprecated]
"to_enum"
"to_s" - to string (for printing)
"type"
"untaint" - mark it clean!

Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Ruby
 * Ruby Programming
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering Ruby are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "More Classes and Objects" training module. You'll find a description of the topic and some other closely related examples on the "More Classes and Objects" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
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