Is_defined?

ruby-talk
1

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

is_class_defined?
is_module_defined?
is_methode_defined?

regards
Eko

2

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

···

On Mon, 28 Feb 2005 12:11:21 +0900, Eko Budi Setiyo <contact_us@haltebis.com> wrote:

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

is_class_defined?
is_module_defined?
is_methode_defined?

--
Austin Ziegler * halostatue@gmail.com
               * Alternate: austin@halostatue.ca

3

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 <halostatue@gmail.com> wrote:

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

Both of the following return "constant."

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

4

Austin Ziegler wrote:

···

On Mon, 28 Feb 2005 12:11:21 +0900, Eko Budi Setiyo ><contact_us@haltebis.com> wrote:

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

Thanks

5

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

-austin

···

On Mon, 28 Feb 2005 12:33:35 +0900, Navindra Umanee <navindra@cs.mcgill.ca> wrote:

Out of curiosity, why doesn't this work:

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

--
Austin Ziegler * halostatue@gmail.com
               * Alternate: austin@halostatue.ca

6

Hi,

  In mail "Re: is_defined?"

···

Navindra Umanee <navindra@cs.mcgill.ca> wrote:

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

7

Hi,

···

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

Austin Ziegler <halostatue@gmail.com> wrote:
> def foo; end
> defined?(foo) # => "method"

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

--
Bertram Scharpf
Stuttgart, Deutschland/Germany
http://www.bertram-scharpf.de