Programmering i Ruby

Den Pragmatiske Programmerers Veiledning
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klassen Symbol
Forelder: Object
Versjon: 1.6

Indeks:

id2name inspect to_i to_s

A Symbol object represents a Ruby name and is generated automatically using the :name literal syntax. The same Symbol object will be created for a given name string for the duration of a program's execution, regardless of the context or meaning of that name. Thus if Fred is a constant in one context, a method in another, and a class in a third, the Symbol :Fred will be the same object in all three contexts.

module One
  class Fred
  end
  $f1 = :Fred
end
module Two
  Fred = 1
  $f2 = :Fred
end
def Fred()
end
$f3 = :Fred
$f1.id » 2299150
$f2.id » 2299150
$f3.id » 2299150

instansmetoder
id2name sym.id2name -> aString

Returns the name corresponding to sym.

:fred.id2name » "fred"

inspect sym.inspect -> aString

Returns the representation of sym as a symbol literal.

:fred.inspect » ":fred"

to_i sym.to_i -> aFixnum

Returns an integer that is unique for each symbol within a particular execution of a program.

to_s sym.to_s -> aString

Synonym for Symbol#id2name .

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Extracted from the book "Programming Ruby - The Pragmatic Programmer's Guide".
Translation to norwegian by Norway Ruby User Group.
Copyright for the english original authored by David Thomas and Andrew Hunt:
Copyright © 2001 Addison Wesley Longman, Inc.
This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at
http://www.opencontent.org/openpub/).

(Please note that the license for the original has changed from the above. The above is the license of the original version that was used as a foundation for the translation efforts.)

Copyright for the norwegian translation:
Copyright © 2002 Norway Ruby User Group.
This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at
http://www.opencontent.org/openpub/).
Distribution of substantively modified versions of this document is prohibited without the explicit permission of the copyright holder.
Distribution of the work or derivative of the work in any standard (paper) book form is prohibited unless prior permission is obtained from the copyright holder.