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APL syntax: Difference between revisions
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APL's core syntactic principles are: | APL's core syntactic principles are: | ||
* [[Array model|Arrays]] as first class citizens | * [[Array model|Arrays]] as first class citizens | ||
* Functions take arrays as | * Functions take arrays as argument(s) and produce arrays as result | ||
* Operators take functions as | * Functions have long right scope | ||
* Operators take functions and/or arrays as operand(s) and produce derived functions | |||
* Operators have long left scope | |||
== Example array definitions == | == Example array definitions == | ||
< | <source lang=apl> | ||
simplenumvec←1 2 3 4 ⍝ A simple numeric vector | simplenumvec←1 2 3 4 ⍝ A simple numeric vector | ||
simplecharvec←'ABCD' ⍝ A simple character vector | simplecharvec←'ABCD' ⍝ A simple character vector | ||
</ | </source> | ||
== Example function definition == | == Example function definition == | ||
< | <source lang=apl> | ||
∇ r←l Tradfn r | ∇ r←l Tradfn r | ||
[1] ⍝ An infix (dyadic) tradfn | [1] ⍝ An infix (dyadic) tradfn | ||
[2] r←l r | [2] r←l r | ||
∇ | ∇ | ||
</ | </source> | ||
{{Works in|[[Dyalog APL]], [[APL2]], [[GNU APL]], [[NARS2000]]}} | {{Works in|[[Dyalog APL]], [[APL2]], [[GNU APL]], [[NARS2000]]}} | ||
== Example operator definition == | == Example operator definition == | ||
< | <source lang=apl> | ||
∇ r←larg(Main OVER PreProc)rarg | ∇ r←larg(Main OVER PreProc)rarg | ||
[1] r←(PreProc larg)Main(PreProc rarg) | [1] r←(PreProc larg)Main(PreProc rarg) | ||
∇ | ∇ | ||
</ | </source> | ||
== Example function application == | == Example function application == | ||
< | <source lang=apl> | ||
</ | ÷3 ⍝ Prefix primitive function | ||
0.3333333333 | |||
1+2 ⍝ Infix primitive function | |||
3 | |||
+/1 2 3 4 ⍝ Prefix primitive derived function | |||
10 | |||
2+/1 2 3 4 ⍝ Infix primitive derived function | |||
3 5 7 | |||
</source> | |||
== Scoping rules == | |||
=== Functions === | |||
=== Operators === | |||
{{APL dialects}} | |||