Reinventing query languages in Smalltalk again?

Post #274,255 by tablizer 11/28/06 5:44:13 PM Reply	Reinventing query languages in Smalltalk again? \nSELECT OS_Name, IIF(osBase='UNIX','Good','Bad') AS Jugdement\nFROM OperatingSystems\n (Some dialects use WHEN...ELSE...END instead of IIF) ________________ oop.ismad.com
Post #274,265 by tuberculosis 11/28/06 7:19:27 PM Reply	Smalltalk queries/collection operations predate SQL by about 5 years I think. Smalltalk collections respond to: select: - provide filtered version of collection ie #( 1 2 3 4 5 6 ) select: [:each \| each isEven]. #(2 4 6) detect: - first found #( 1 2 3 4 5 6 ) detect: [:each \| each > 3 and: [each isOdd]]. 5 reject: - inverted select #( 1 2 3 4 5 6 ) select: [:each \| each isEven]. #(1 3 5) collect: - used to derive a new collection from an existing one #( 1 2 3 4 5 6 ) collect: [:each \| each * 5]. #(5 10 15 20 25 30) Nothing to reinvent, really. We were here first. [link\|http://www.blackbagops.net\|Black Bag Operations Log] [link\|http://www.objectiveclips.com\|Artificial Intelligence] [link\|http://www.badpage.info/seaside/html\|Scrutinizer]
Post #274,309 by tablizer 11/29/06 1:57:56 AM Reply	It does not predate OTHER relational languages ________________ oop.ismad.com
Post #274,313 by folkert 11/29/06 4:01:51 AM Reply	What are you NUTS? Smalltalk? seriously any of the talk languages... You are on Drugs. -- [link\|mailto:greg@gregfolkert.net\|greg], [link\|http://www.iwethey.org/ed_curry\|REMEMBER ED CURRY!] @ i_wethey* Freedom is not FREE. Yeah, but 10s of Trillions of US Dollars? SELECT * FROM scog WHERE ethics > 0; 0 rows returned.
Post #274,698 by tablizer 12/3/06 5:51:24 PM Reply	First relational languages appeared in the early 70's and earlier if you count Codd's math notation. ________________ oop.ismad.com
Post #274,707 by crazy 12/3/06 7:15:56 PM Reply	Smalltalk was 71 [link\|http://www.levenez.com/lang/history.html#03\|http://www.levenez.c...g/history.html#03] Don't bother quoting Codd's math notation. Not implemented == not exists. You may now put your pipe down.
Post #274,708 by ChrisR 12/3/06 7:24:49 PM 12/3/06 7:28:35 PM Reply	Some context... Map, Filter, and Reduce are morphisms arising from mathematics. Likely that if you want to find the first use in programming languages, you'd probably find them in Lisp. But then Smalltalk was heavily influenced by Lisp (and Algol), so that wouldn't be surprising. Map applies a function over a collection. Filter applies a predicate to a collection and returns a subset where the predicate is true. Reduce is a fold of a collection. Guess I should also reuse my explanation of [link\|http://z.iwethey.org/forums/render/content/show?contentid=247589\|Higher Order Functions] in an earlier thread. Edited by ChrisR Dec. 3, 2006, 07:28:35 PM EST Expand All History

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