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Fix endsWith off-by-one error

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Richard Feldman 2022-07-22 10:54:21 -04:00 • committed by Folkert
parent 7cf5732001
commit 6f1932eae4
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5
crates/compiler/builtins/roc/List.roc
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@ -897,9 +897,10 @@ endsWith : List elem, List elem -> Bool
endsWith = \list, suffix -> endsWith = \list, suffix ->
# TODO once we have seamless slices, verify that this wouldn't # TODO once we have seamless slices, verify that this wouldn't
# have better performance with a function like List.compareSublists # have better performance with a function like List.compareSublists
start = List.len list - len length = List.len suffix
start = Num.subSaturated (List.len list) length
suffix == List.sublist list { start, len: List.len suffix } suffix == List.sublist list { start, len: length }
## Splits the list into two lists, around the given index. ## Splits the list into two lists, around the given index.
## ##