APL syntax

From APL Wiki
Revision as of 14:49, 20 November 2019 by RichPark (talk | contribs) (7 revisions imported: Migrate from miraheze)
Jump to navigation Jump to search
The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.

APL's core syntactic principles are:

  • Arrays as first class citizens
  • Functions take arrays as argument(s) and produce arrays as result
  • 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

      simplenumvec←1 2 3 4 ⍝ A simple numeric vector
      simplecharvec←'ABCD' ⍝ A simple character vector

Example function definition

    ∇  r←l Tradfn r              
[1]    ⍝ An infix (dyadic) tradfn
[2]    r←l r                     
    ∇

Example operator definition

     ∇ r←larg(Main OVER PreProc)rarg                                                 
[1]    r←(PreProc larg)Main(PreProc rarg)                                            
     ∇

Example function application

      ÷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

Scoping rules

Functions

Operators

APL dialects [edit]
Maintained APL+WinAPL2APL64APL\ivApletteAprilCo-dfnsDyalog APLDyalog APL Visiondzaima/APLGNU APLKapNARS2000Pometo
Historical A Programming LanguageA+ (A) ∙ APL#APL2CAPL\360APL/700APL\1130APL\3000APL.68000APL*PLUSAPL.jlAPL.SVAPLXExtended Dyalog APLIverson notationIVSYS/7090NARSngn/aplopenAPLOperators and FunctionsPATRowanSAXSHARP APLRationalized APLVisualAPL (APLNext) ∙ VS APLYork APL
Derivatives AHPLBQNCoSyELIGleeIIvyJJellyK (Goal, Klong, Q) ∙ KamilaLispLang5LilNialRADUiua
Overviews Comparison of APL dialectsTimeline of array languagesTimeline of influential array languagesFamily tree of array languages