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Quotations are the general term for anonymous functions or lambdas. They denote a snippet of code which can be executed later. Their exact syntax varies by language. For example, Factor denotes quotations using square-brackets. Whereas, Tal and Postscript denote them using curly-brackets. Regardless of syntax, they are core to constructing higher-order functions in concatenative languages.
A higher-order function is an operation that utilize other functions as inputs or create new functions as outputs. This feature is leverage by a core utility of concatenative programming: combinators. They enable a programmer to name code not values.
{ 1 2 3 4 } [ sq ] map
// [1, 4, 9, 16] [1, 2, 3, 4] { dup (*) } map
Uxntal has no built-in map
, see implementation.
{ 01 02 03 04 } { DUP MUL JMP2r } map
Uxntal can also quote single opcodes:
( to quote ) LIT ADD ( to unquote ) #00 STR
This revision created on Thu, 21 Mar 2024 03:38:22 by evincarofautumn (Update Kitten example.)