ACM SIGAPL APL Quote Quad
ACM SIGAPL APL Quote Quad
A future APL: examples and problems
APL '89 Conference proceedings on APL as a tool of thought
APL '89 Conference proceedings on APL as a tool of thought
Communications of the ACM
APL '90 Conference proceedings on APL 90: for the future
APL '91 Proceedings of the international conference on APL '91
CATS: computer aided testing of software
APL '91 Proceedings of the international conference on APL '91
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APL derives great expressive power from seemingly trivial features, such as empty arrays, but there is still resistance to the implementation of the elementary trivial functions including left/stop ⊣ and right/pass ⊢, which perform no calculations. This paper defines functional triviality; describes trivial functions and operators and their uses; discusses the mathematical basis of their expressive power; and defines new trivial functions and operators. It urges implementation of several of these functions as primitives for reasons of efficiency and expressiveness, and considers their efficient implementation via idiom recognition.