Small Snippets with Wisp

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Small snippets from my Wisp REPL.

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2d6 + d10, all results

Calculate all possible results for rolling 2d6 and 1d10. This got a bit out of hand while I generalized it to arbitrary dice.

It is absolutely brute-force.

import : srfi srfi-1
define : roll-dice . dice
  . "Roll arbitrary DICE.

Each die is a list of its faces. Example: roll-dice '(1 2 3 4) '(1 2 3 4)"
  define : roll mod . dice
    . "Roll DICE with modifier MOD. Example: 1d6+2 is roll 2 '(1 2 3 4 5 6)"
    cond
       : null? dice
         . '()
       : null? : cdr dice
         map : λ (pip) : + pip mod
               car dice
       else
         apply append 
             map : λ (pip) : apply roll : cons (+ pip mod) : cdr dice
               car dice
  apply roll : cons 0 dice


define : frequency results
    . "Count the frequency of numbers in the results"
    define counter : make-hash-table
    define : count value
        hash-set! counter value
             + 1 : if (hash-ref counter value) (hash-ref counter value) 0
    map count results
    sort : hash-map->list cons counter
           λ (x y) : < (car x) (car y)

define d6 '(1 2 3 4 5 6)
define d10 '(0 1 2 3 4 5 6 7 8 9)
frequency : roll-dice d6 d6 d10