Dfn: Difference between revisions

Revision as of 12:28, 20 December 2019

A dfn (pronounced "dee fun") is an alternative way to define a function and operator, invented by John Scholes. A dfn operator can also be called a dop (pronounced "dee op").

As of 2020, dfns are fully implemented in Dyalog APL, NARS2000, ngn/apl, dzaima/APL, and partially in GNU APL.

Wikipedia has a full treatment of dfns.

Documentation

Dyalog

External links

Wikipedia: Direct function
Dyalog Ltd.'s dfns website (created and, until his passing, maintained by John Scholes)

APL syntax [edit]
General	Comparison with traditional mathematics ∙ Precedence ∙ Tacit programming (Train, Hook, Split composition)
Array	Numeric literal ∙ String ∙ Strand notation ∙ Object literal ∙ Array notation (design considerations)
Function	Argument ∙ Function valence ∙ Derived function ∙ Derived operator ∙ Niladic function ∙ Monadic function ∙ Dyadic function ∙ Ambivalent function ∙ Defined function (traditional) ∙ Dfn ∙ Function train
Operator	Operand ∙ Operator valence ∙ Tradop ∙ Dop ∙ Derived operator
Assignment	Multiple ∙ Indexed ∙ Selective ∙ Modified
Other	Function axis ∙ Bracket indexing ∙ Branch ∙ Statement separator ∙ Quad name ∙ System command ∙ User command ∙ Keyword ∙ Dot notation ∙ Function-operator overloading ∙ Control structure ∙ Comment

@@ Line 8: / Line 8: @@
 == External links ==
 * [[Wikipedia: Direct function]]
-* [[Dyalog Ltd.]]'s [https://dfns.dyalog.com dfns website] (created and maintained by John Scholes until his passing)
+* [[Dyalog Ltd.]]'s [https://dfns.dyalog.com dfns website] (created and, until his passing, maintained by John Scholes)
 {{APL syntax}}

Dfn: Difference between revisions

Revision as of 12:28, 20 December 2019

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