Quackery

Quackery is an open source, lightweight, entry level concatenative language for educational and recreational programming.

It is coded as a Python 3 function in under 48k of Pythonscript, half of which is a string of Quackery code.

The Quackery GitHub repository, which includes the Quackery manual The Book of Quackery in pdf form, is at http://sbcl.sourceforge.net The full code, examples, and The Book of Quackery are in the repository as quackery.zip.

The Quackery Facebook group is at https://www.facebook.com/groups/thequackerygroup

Examples of Quackery code

Naive Recursive Fibonacci

  [ dup  2 < if done
    dup  1 - recurse
    swap 2 - recurse + ]        is fibonacci    (       n --> n       )

Insertion Sort

  [ ]'[ sort.test put
    [] swap witheach
      [ swap 2dup findwith
        [ over sort.test share
          do ] [ ]
        nip stuff ]
    sort.test release ]         is sortwith     (       [ --> [       )

  [ sortwith > ]                is sort         (       [ --> [       )

(]'[ is called "meta-quote" - it grants the behaviour of ' ("quote') to sortwith as syntactic sugar. Without the meta-quotein sortwith sort would be defined as [ ' > sortwith ] is sort)

A Quackery Quine

[ this unbuild $ " is quine" join quackery ]

This nest creates a Quackery word called quine that creates a copy of itself.

1. this -- put a copy of the nest it is in (a nest is items bounded by [ and ]) on the stack.
2. unbuild -- decompile the item on the top of stack.
3. $ " is quine" -- put the string literal " is quine" on the top of stack.
4. join -- concatenate top two items.
5. quackery -- compile and evaluate ToS. (quackery is defined as [ build do ] is quackery)