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}}

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==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)

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The definition at the very start of the article is very hard to parse. It overuses analogy and is quite confusing. Perhaps later in the intro section it might be comprehensible, but at 0300 in the morning w/ a non-working GRUB2 EFI configuration hanging over my head, I just ditched trying to read the article and leave this short note waiting for the rest of my update to download.

'''PleaseThe startdefinition/intro is ambiguous and seems to muddle up the articlenotion withof awhat definition.'''is being E.g.iterated, ''"Inwhat athe programmingiterator languageis, aand generatorhow it is implemented..."''. Try to stay at a very non-computer science language level with the initial definition or include the WP article link for every bit of jargon you need to be clear. SoYou youcould, however, start by saying that a generator is aspecific typecase of an [[Iterator]]... WhatHowever, younearly shouldevery notCS saytopic ishas, thatsomeplace, ita isfairly likeclear andefinition array,using sincebasic itmathematics/logic isn'tterms anythingthat likemost anreasonable array.educated individuals You might usewithout a generator to access valuesdegree in an array. YouCS can useunderstand. a bucket to empty a bathtub full of soapy water, but don't confuse the bucket with the bathwater (and for heaven's sake, take the baby out first!).

What you should not say is that it is like an array, since it isn't anything like an array. You might use a generator to access values in an array, but it isn't the array. You can use a bucket to empty a bathtub full of soapy water, but don't confuse the bucket with the bathwater (and for heaven's sake, take the baby out first!).

Sorry, but most of my programming experience is with Java (w/o generators as a built in, but I am sure I have had to write thousands of them w/o ever knowing what the hell I was doing), or I would try my hand at a new intro. <!-- Template:Unsigned IP --><small class="autosigned">—&nbsp;Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/75.73.1.89|75.73.1.89]] ([[User talk:75.73.1.89#top|talk]]) 09:16, 13 January 2017 (UTC)</small> <!--Autosigned by SineBot-->