Talk:Undefined values: Difference between revisions

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rosettacode>Dmitry-kazakov

Revision as of 03:04, 28 November 2009 (view source) MikeMol (talk \| contribs) (Not sufficiently distinct from the NULL task)		Latest revision as of 15:53, 15 July 2010 (view source) rosettacode>Dmitry-kazakov No edit summary
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Line 1: After discussion on IRC, it was noted that "undefined" as this task is not significantly ~~disctinct~~distinct from NULL. However, I prefer this task's "identify and exercise the mechanisms" approach, as opposed to [[~~NULL~~Null]]'s more specific "check" approach. I'm certainly open to ~~other~~others's thoughts on how to effect improvement of the NULL task, make this task sufficiently distinct, or possibly deprecate that task. --[[User:Short Circuit\|Michael Mol]] 03:04, 28 November 2009 (UTC) :Tangentially, if this task is to be distinct from [[Null]] by way of being "talk about this" rather than "do this specific thing" (which is IMO an excellent split to have; cf. [[Eval]] and [[Eval in environment]], created by me), then they should use the ''same terminology''. —[[User:Kevin Reid\|Kevin Reid]] 03:24, 28 November 2009 (UTC) :It is distinct from [[Null]], at least in the context of [[Ada]] and other [strongly typed] languages where null is a legal ''defined'' value, as opposed to an illegal ''undefined'' value. I presume that some other solutions are wrong in this sense, i.e. when ''defined'' = any value from the type's domain set. In a properly typed language an object may bot have an ''undefined'' value unless something was badly wrong. --[[User:Dmitry-kazakov\|Dmitry-kazakov]] 15:53, 15 July 2010 (UTC)