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'''John Morley Scholes''' (1948–2019) was a British computer scientist. His professional career was devoted to the development of APL. He was the first lead developer at what eventually became [[Dyalog Ltd.]] and kept working for the company until his death, since when he has dedicated himself to the art of writing perfect programs.<ref>[http://dfns.dyalog.com/n_beyond.htm ''The Beyond''], dfns workspace.</ref> He was the designer and implementer of [[Dyalog APL]]'s direct functions ([[dfn]]s, pronounced "dee funs"), a major distinguishing advance which was since copied by all new APLs; [[NARS2000]], [[GNU APL]], [[ngn/apl]], [[dzaima/APL]], etc. He also advocated for simplicity in computer systems.
'''John Morley Scholes''' (1948–2019) was a British computer scientist. His professional career was devoted to the development of APL. He was the first lead developer at what eventually became [[Dyalog Ltd.]] and kept working for the company until his death, since when he has dedicated himself to the art of writing perfect programs.<ref>[http://dfns.dyalog.com/n_beyond.htm ''The Beyond''], dfns workspace.</ref> He was the designer and implementer of [[Dyalog APL]]'s direct functions ([[dfn]]s, pronounced "dee funs"), a major distinguishing advance which was since copied by all new APLs; [[NARS2000]], [[GNU APL]], [[ngn/apl]], [[dzaima/APL]], etc. He also advocated for simplicity in computer systems.


In 2009, Scholes produced an explanatory video of his implementation of John Conway's "Game of Life". It has since gathered almost 200 000 views. He has also produced numerous, always well-received, presentation and papers on various subjects from the technical to the humorous.
In 1995 he and [[Pete Donnelly]] received the [[Iverson Award]] for their role in creating and promoting Dyalog APL.
 
In 2009, Scholes produced an explanatory video of his implementation of John Conway's "Game of Life". It has since gathered over 200 000 views. He has also produced numerous, always well-received, presentation and papers on various subjects from the technical to the [[humor]]ous.


== Publications ==
== Publications ==
* [https://doi.org/10.1145/75144.75159 "YSM: a full-screen manager for Dyalog APL"] at [[APL89]]. With S. D. Curtin.
* [http://dfns.dyalog.com/downloads/howcomp.pdf Article: ''How to Write Computer Programs'']


=== Dyalog user meetings ===
=== Dyalog user meetings ===
 
{{Main|Dyalog user meeting}}
<div style="column-width:30em">
* [[Dyalog '06]] 04: Language Extensions
* [[Dyalog '06]] 04: Language Extensions
*  Dyalog '06  07: Functions as Results ([https://www.dyalog.com/uploads/conference/dyalog06/presentations/07_Scholes_FuncsAsResults materials])
*  Dyalog '06  07: Functions as Results ([https://www.dyalog.com/uploads/conference/dyalog06/presentations/07_Scholes_FuncsAsResults materials])
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* [[Dyalog '08]] 06: Interpreter Performance (with [[Nic Delcros]])
* [[Dyalog '08]] 06: Interpreter Performance (with [[Nic Delcros]])
*  Dyalog '08  08: [https://dyalog.tv/Dyalog08/?v=TwvgyNOtoK8 Journaled Files] ([https://www.dyalog.com/uploads/conference/dyalog08/presentations/08_SmithScholes_JournaledFiles.ppt materials]) (with [[Richard Smith]])
*  Dyalog '08  08: [https://dyalog.tv/Dyalog08/?v=TwvgyNOtoK8 Journaled Files] ([https://www.dyalog.com/uploads/conference/dyalog08/presentations/08_SmithScholes_JournaledFiles.ppt materials]) (with [[Richard Smith]])
*  Dyalog '08  [https://dyalog.tv/Dyalog08/?v=SqTO9eZ4zg4 A Plea for Simplicity]
* [[Dyalog '09]] 19: [https://dyalog.tv/Dyalog09/?v=8ic0ctto1HU Complex Numbers]
* [[Dyalog '09]] 19: [https://dyalog.tv/Dyalog09/?v=8ic0ctto1HU Complex Numbers]
*  Dyalog '09  C03: Introduction to D-Functions (dfns) ([https://dyalog.tv/Dyalog09/?v=OZARVrGQQho VIDEO 1 (124 mins)], [https://dyalog.tv/Dyalog09/?v=RQNSe9s_3eE VIDEO 2 (67 mins)])
*  Dyalog '09  C03: Introduction to D-Functions (dfns) ([https://dyalog.tv/Dyalog09/?v=OZARVrGQQho VIDEO 1 (124 mins)], [https://dyalog.tv/Dyalog09/?v=RQNSe9s_3eE VIDEO 2 (67 mins)])
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* [[Dyalog '17]] D04: [https://dyalog.tv/Dyalog17/?v=74xrZkVlns0 A Case Study – Recoding from Procedural to Denotative Style] ([https://www.dyalog.com/uploads/conference/dyalog17/presentations/D04_Recoding_from_Procedural_to_Denotative_Style.pdf slides])
* [[Dyalog '17]] D04: [https://dyalog.tv/Dyalog17/?v=74xrZkVlns0 A Case Study – Recoding from Procedural to Denotative Style] ([https://www.dyalog.com/uploads/conference/dyalog17/presentations/D04_Recoding_from_Procedural_to_Denotative_Style.pdf slides])
*  Dyalog '17  D15: TAO – Total Array Ordering ([https://www.dyalog.com/uploads/conference/dyalog17/presentations/D15_TAO_of_Dyalog.zip materials]) (with [[Roger Hui]])
*  Dyalog '17  D15: TAO – Total Array Ordering ([https://www.dyalog.com/uploads/conference/dyalog17/presentations/D15_TAO_of_Dyalog.zip materials]) (with [[Roger Hui]])
*  Dyalog '17  D17: Prefix Agreement: A Proposal for an Extension to the <source lang=apl inline>@</source> Operator ([https://www.dyalog.com/uploads/conference/dyalog17/presentations/D17_Extension_to_the_At_Operator.pdf slides])
*  Dyalog '17  D17: Prefix Agreement: A Proposal for an Extension to the <syntaxhighlight lang=apl inline>@</syntaxhighlight> Operator ([https://www.dyalog.com/uploads/conference/dyalog17/presentations/D17_Extension_to_the_At_Operator.pdf slides])
* [[Dyalog '18]] D10: [https://dyalog.tv/Dyalog18/?v=y33XDD6ANt0 Dfns – Past, Present and Future] ([https://www.dyalog.com/uploads/conference/dyalog18/presentations/D10_Dfns_Past_Present_Future.pdf slides])
* [[Dyalog '18]] D10: [https://dyalog.tv/Dyalog18/?v=y33XDD6ANt0 Dfns – Past, Present and Future] ([https://www.dyalog.com/uploads/conference/dyalog18/presentations/D10_Dfns_Past_Present_Future.pdf slides])
</div>
=== Other talks ===
* [[Dyalog webinar]]: [https://dyalog.tv/Webinar/?v=OeOpdGF1bnc A closer look at the new primitives in version 16.0] (with [[Morten Kromberg]])


== External links ==
== External links ==
<div style="column-width:30em">


=== Websites ===
=== Websites ===


* [[wikipedia:John_M._Scholes_(computer_scientist)|Wikipedia: John Scholes]]
* [[wikipedia: John_M._Scholes_(computer_scientist)|Wikipedia: John Scholes]]
* [[Wikipedia: Direct functions]]
* [[Wikipedia: Direct functions]]
* [http://johnscholes.rip/ Memorial website]
* [http://johnscholes.rip/ Memorial website]


=== Selected works ===
=== Selected videos ===


* [https://www.youtube.com/watch?v=a9xAKttWgP4 Video: ''Game of Life'']
* [https://www.youtube.com/watch?v=a9xAKttWgP4 ''Game of Life'']
* [https://www.youtube.com/watch?v=qSVR4Z3DA24 Video: ''A Plea for Simplicity'']
* [https://www.youtube.com/watch?v=DmT80OseAGs ''A Sudoku Solver in APL'']
* [http://dfns.dyalog.com/downloads/howcomp.pdf Article: ''How to Write Computer Programs'']
* [https://www.youtube.com/watch?v=DsZdfnlh_d0 ''Depth-first search in APL'']
* [https://www.youtube.com/watch?v=grTobtCpRUE ''Calling Alan Turing'']
</div>


== References ==
== References ==
<references/>
<references/>
{{APL community}}[[Category:People|Scholes]]
{{APL community}}{{DEFAULTSORT:Scholes}}[[Category:People]][[Category:Dyalog Ltd. employees]][[Category:Designers]][[Category:Executives]][[Category:Implementers]]
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