mu - Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.

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c@akkartik.com> 2015-07-28 14:33:22 -0700 1868 - start using naked literals everywhere' href='/akkartik/mu/commit/factorial.mu?h=hlt&id=bc6436927640603675e2e700007f53c5ab213869'>bc643692 ^

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# example program: compute the factorial of 5

def main [
  local-scope
  x:number <- factorial 5
  $print [result: ], x, [ 
]
]

def factorial n:number -> result:number [
  local-scope
  load-ingredients
  {
    # if n=0 return 1
    zero?:boolean <- equal n, 0
    break-unless zero?
    return 1
  }
  # return n * factorial(n-1)
  x:number <- subtract n, 1
  subresult:number <- factorial x
  result <- multiply subresult, n
]

# unit test
scenario factorial-test [
  run [
    1:number <- factorial 5
  ]
  memory-should-contain [
    1 <- 120
  ]
]


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