is_defined?

[Eko Budi Setiyo]

Any body now how to do some thing like this in ruby

is_class_defined?
is_module_defined?
is_methode_defined?

regards
Eko

 

[Austin Ziegler]

Any body now how to do some thing like this in ruby

is_class_defined?
is_module_defined?
is_methode_defined?

def foo; end
defined?(foo) # => "method"

Both of the following return "constant."

class Foo; end
module Bar; end
defined?(Foo) # => "constant"
defined?(Bar) # => "constant"

-austin

 

[Navindra Umanee]

def foo; end
defined?(foo) # => "method"

Both of the following return "constant."

class Foo; end
module Bar; end
defined?(Foo) # => "constant"
defined?(Bar) # => "constant"

Out of curiosity, why doesn't this work:

irb(main):014:0> defined? defined?
SyntaxError: compile error
(irb):14: syntax error
from (irb):14

Cheers,
Navin.

 

[Austin Ziegler]

Out of curiosity, why doesn't this work:

irb(main):014:0> defined? defined?
SyntaxError: compile error
(irb):14: syntax error
from (irb):14

defined? may be a keyword. I don't recall for certain.

-austin

 

[Eko Budi Setiyo]

def foo; end
defined?(foo) # => "method"

Both of the following return "constant."

class Foo; end
module Bar; end
defined?(Foo) # => "constant"
defined?(Bar) # => "constant"

-austin

Thanks

 

[Minero Aoki]

Hi,

In mail "Re: is_defined?"

Out of curiosity, why doesn't this work:

irb(main):014:0> defined? defined?
SyntaxError: compile error

Because second defined? does not have argument.

~ % ruby -e 'p defined?(defined?(nil))'
"expression"

Minero Aoki

 

[Bertram Scharpf]

Hi,

Am Montag, 28. Feb 2005, 12:33:35 +0900 schrieb Navindra Umanee:

Out of curiosity, why doesn't this work:

irb(main):014:0> defined? defined?
SyntaxError: compile error
(irb):14: syntax error
from (irb):14

`defined?' is an operator, not a method.

This is confusing as `Module#method_defined?' and
`Module#const_defined?' are methods.

Bertram