Halfwit

Halfwit is an experimental golfing language that fits most commands in half a byte. It's stack-based.

Usage

npm install halfwit
node main.js <filename> [single string of flags] [inputs]

Or in node.js:

const halfwit = require('halfwit')

Or in a website:

<script src='/path/to/halfwit.js'></script>

Flags

Halfwit has several flags:

• e - execute the filename as code
• A - print as chars
• c - print compiled code
• C - count source length in Halfwit codepage
• s - compress list / int
• t - print tokens
• p - print parsed tokens
• h - print flag help menu

Builtins

Some builtins take up .5 bytes, some 1, and some 1.5.

.5 bytes

• [ - condition ([...;)
• M - map (M...;)
• { - while (condition) do stuff ({...;...;), condition = first part
• ;; - terminate structure
• + - Addition, vectorising
• * - Multiplication, vectorising
• J - join - append / prepend / pair
• > - Starts a compressed int - >...< / adds to a compressed int list >...>...<
• < - end int / intlist (see above) / length / range 0...n-1
• N - negate / reverse
• f - flatten / square
• b - base conversion:
  • Int, int -> to_base
  • Int, list -> to-custom-base
  • List, int -> from-base
  • list, list -> from-custom-base
• : - Duplicate
• $ - Swap
• ? - Take input
• k - Digraph modifier

Note that all of these can be represented as a single character as well as the encoding.

1 byte

• k* / e - exponentiation, vectorising
• k+ / / - floor division
• k[ / | - [...|...; else in an if block, otherwise |...; -> if not
• kM / ( -> for (same stack) - (...;
• k; / % - modulo (vectorising)
• k{ / E - Eqiuvalent of (n
• kN / n -
  • in ( / M / F: Push context (loop var)
  • in global scope: Push 1
• kJ / S - Sum / is prime
• k? / i - index value (s) into list / bitwise xor
• k< / l - Comparison (less than)
• kf / F - Filter - F...;
• kb / R - Reduce R...;
• k: / _ - Pop stack
• k> / } - rotate stack right
• k$ / r - range (inclusive)
• kk : useful constants

1.5 bytes

• kk[ / 0 - 100

• kkM / 1 - 256

• kk{ / 2 - 26

• kk; / 3 - 50

• kk+ / 4 - [0, 1]

• kk* / 5 - 128

• kkJ / 6 - 64

• kk> / 7 - 32

• kk< / 8 - 16

• kkN / 9 - 1000

• kkf / s - sort / prime factors

• kkb / Z:

  • list, list -> zip
  • int, list -> repeat (vectorised)
  • list, int -> repeat
  • int, int -> repeat

• kk: / D - is a divisible by B? (vectorising)

• kk$ / W - stack = [stack]

• kk? / , - prettyprint with trailing newline

• kkk / . - Print as chars without trailing newline

Not scored

These are debugging instructions that aren't included in the codepage.

• x - Print stack