class methods

[Mark Volkmann]

I thought this would be easy, so it's embarassing to ask.
How can I get a list of the class methods in a given class?
I know I can get public instance methods like this.

MyClass.instance_methods.sort.each {|m| puts m}

 

[Trans]

Class is an Object too, so

MyClass.methods.sort.each {|m| puts m}

T.

 

[Joe Van Dyk]

I thought this would be easy, so it's embarassing to ask.
How can I get a list of the class methods in a given class?
I know I can get public instance methods like this.

MyClass.instance_methods.sort.each {|m| puts m}

MyClass.methods

(I think)

class Foo
def self.class_method_foo
end

def public_method_foo
end
end

Foo.methods.include? "class_method_foo" =3D> true
Foo.methods.include? "public_method_foo" =3D> false

 

[Mark Volkmann]

Class is an Object too, so

MyClass.methods.sort.each {|m| puts m}

The method "methods" returns ALL the methods.
I want just the class methods, those I can invoke without creating an
object from the class.
For example, querying the class Thread should give me "current", but
not "alive?".

 

[Bob Showalter]

The method "methods" returns ALL the methods.
I want just the class methods, those I can invoke without creating an
object from the class.
For example, querying the class Thread should give me "current", but
not "alive?".

If you want only the methods that are specific to Thread:

Thread.methods - Thread.class.methods

(I'm new to ruby, so forgive me if this is not the correct approach)

 

[Jason Voegele]

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The method "methods" returns ALL the methods.
I want just the class methods, those I can invoke without creating an
object from the class.
For example, querying the class Thread should give me "current", but
not "alive?".

I think you're looking for Thread.singleton_methods:

irb(main):001:0> Thread.singleton_methods
=3D> ["stop", "abort_on_exception", "current", "new", "fork", "critical",=20
"abort_on_exception=3D", "pass", "start", "exit", "list", "critical=3D", "k=
ill",=20
"main"]

=2D-=20
Jason Voegele
You will always find something in the last place you look.

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[Devin Mullins]

I think you're looking for Thread.singleton_methods:

irb(main):001:0> Thread.singleton_methods
=> ["stop", "abort_on_exception", "current", "new", "fork", "critical",
"abort_on_exception=", "pass", "start", "exit", "list", "critical=", "kill",
"main"]

Thread.methods(false) works, too. This is new to 1.8, so you're not
going to see it in the typical free documentation (PickAxe1, or ri docs).

Devin

 

[Robert Klemme]

The method "methods" returns ALL the methods.
I want just the class methods, those I can invoke without creating an
object from the class.
For example, querying the class Thread should give me "current", but
not "alive?".

alive? is not returned from Thread.methods:

$ ruby -e 'p Thread.methods.grep(/alive/)'
[]

Robert@Babelfish2 ~
$ ruby -e 'Thread.methods.each {|m| puts m unless Thread.respond_to? m}'

Robert@Babelfish2 ~

Thread actually *does* respond to all these methods.

As Jason pointed out you're probably looking for Thread.singleton_methods.

Kind regards

robert

 

[David A. Black]

Hi --

I thought this would be easy, so it's embarassing to ask.
How can I get a list of the class methods in a given class?
I know I can get public instance methods like this.

MyClass.instance_methods.sort.each {|m| puts m}

See other answers for main answer, but also:

puts array

is the same as

array.each {|e| puts e }




David

 

[Joe Van Dyk]

The method "methods" returns ALL the methods.
I want just the class methods, those I can invoke without creating an
object from the class.
For example, querying the class Thread should give me "current", but
not "alive?".

Didn't you see my post?

class Foo
def self.class_method_foo
end

def public_method_foo
end
end

Foo.methods.include? "class_method_foo" =3D> true
Foo.methods.include? "public_method_foo" =3D> false



Also,

Mac-Mini:~ joevandyk$ irb
irb(main):001:0> Thread.methods.include? "alive?"
=3D> false
irb(main):002:0> Thread.methods.include? "current"
=3D> true