52 lines
1.9 KiB
Plaintext
52 lines
1.9 KiB
Plaintext
app [main] { pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.16.0/O00IPk-Krg_diNS2dVWlI0ZQP794Vctxzv0ha96mK0E.tar.br" }
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import pf.Stdout
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# Functions to work with in the reduce function
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add = \a, b -> a + b
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mult = \a, b -> a * b
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reduce : (List (Num a)), U64, Num a, (Num a, Num a -> Num a) -> Num a
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reduce = \nums, counter, neutral, func ->
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if counter == (List.len nums) then
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neutral
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else
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currentValue = listI nums counter
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(func currentValue (reduce nums (counter + 1) neutral func))
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sum : (List (Num a)), U64 -> Num a
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sum = \nums, counter ->
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if counter == (List.len nums) then
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0
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else
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currentValue = listI nums counter
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((sum nums (counter + 1)) + currentValue)
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# Gets the value in a list at a given index
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# Returns 0 if the index is out of bounds
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listI: (List (Num a)), U64 -> Num a
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listI = \list, i ->
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res = List.get list i
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when res is
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Ok value -> value
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Err OutOfBounds -> 0
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main =
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firstHun = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100]
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firstTen = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
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sumFirstHundred = sum firstHun 0
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sumFirstHundredReduce = reduce firstHun 0 0 add
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productFirstTenReduce = reduce firstTen 0 1 mult
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Stdout.line! "Sum first 100 rational numbers = $(Num.toStr sumFirstHundred)"
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Stdout.line! "Sum first 100 rational numbers using reduce = $(Num.toStr sumFirstHundredReduce)"
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Stdout.line! "Product first 10 rational numbers = $(Num.toStr productFirstTenReduce)" |