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List.sublist: make sure input list is decremented if slice length is 0

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Folkert 2022-07-12 22:51:44 +02:00
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crates/compiler/builtins/roc/List.roc
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@ -820,7 +820,11 @@ findIndex = \list, matcher ->
## Some languages have a function called **`slice`** which works similarly to this. ## Some languages have a function called **`slice`** which works similarly to this.
sublist : List elem, { start : Nat, len : Nat } -> List elem sublist : List elem, { start : Nat, len : Nat } -> List elem
sublist = \list, config -> sublist = \list, config ->
sublistLowlevel list config.start config.len if config.len == 0 then
[]
else
sublistLowlevel list config.start config.len
sublistLowlevel : List elem, Nat, Nat -> List elem sublistLowlevel : List elem, Nat, Nat -> List elem