Talk:Generator (computer programming): Difference between revisions

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{{Talk header}}

{{WikiProject Computing}}

{{WikiProject banner shell|class=Start|

{{findsourcesnotice|generator|iterator}}

{{WikiProject Computing|importance=Low}}

{{WikiProject Computer science|importance=Mid}}

{{WikiProject Software|importance=Low}}

}}

==Origin of the concept==

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(excluding languages which ''can'' implement generator functionality (via more general support for continuations or coroutines), but don't really support them as a native idiom)

*[[Aldor]] [http://www.aldor.org/docs/HTML/chap9.html]

*[[Icon programming language|Icon]] (already done)

*[[Panacea programming language|Panacea]] (mentioned in [[Randall Hyde]]'s ''Art of Assembly Language'', [http://webster.cs.ucr.edu/AoA/DOS/ch12/CH12-6.html Ch. 12.5 Iterators])

*[[Unicon programming language|Unicon]]

*[[Raku (programming language)|Raku]] ... lazy lists?

== Generators versus continuations ==

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The Generator expression example for Icon can be simplified and does not require a co-expression.

<sourcesyntaxhighlight lang=pascal>

local j

every j := (|seq(0) \ 20) ^2 do # Produced the first 20 squares

write(j)

</syntaxhighlight>

</source>

If the idea is to demonstrate really what Icon can do in terms of using generators outside a loop construct, the following may be a better example

<sourcesyntaxhighlight lang=pascal>

# find the first matching element

a := [1,2,3,4]

b := [5,6,2,7]

c := ( !a = !b ) | &null # assign first matching element, or set to &null

</syntaxhighlight>

</source>

[[User:CheyenneWills|CheyenneWills]] ([[User talk:CheyenneWills|talk]]) 20:01, 16 June 2010 (UTC)