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CoSy is a stack-based APL influenced language written by Bob Armstrong of Coherent Systems Inc. CoSy is implemented as a vocabulary of defined words that extends Reva Forth to provide array capabilities. CoSy has been re-implemented twice. The original implementation was in flat APL, the second in K, and finally the current implementation in Forth.


CoSy has many major departures from the APL tradition: Most notably, it uses keywords for primitive functions.

All arrays in CoSy are simple lists. This makes it comparable to K and RAD. Similar to those languages, it also allows usage of functions as data using Forth's quoting.

See also

APL dialects [edit]
Maintained APL+WinAPL2APL64APL\ivApletteAprilCo-dfnsDyalog APLdzaima/APLExtended Dyalog APLGNU APLKAPNARS2000Pometo
Historical A Programming LanguageA+ (A) ∙ APL#APL\360APL/700APL\1130APL\3000APL.68000APL*PLUSAPL.jlAPL.SVAPLXIverson notationIVSYS/7090NARSngn/aplopenAPLOperators and FunctionsPATRowanSAXSHARP APLRationalized APLVisualAPL (APLNext) ∙ VS APLYork APL
Derivatives AHPLBQNCoSyELIGleeIIvyJJellyJellyfishK (Q, KDB+) ∙ Lang5NialRAD
Overviews Timeline of array languagesTimeline of influential array languagesFamily tree of array languages