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Fix List.filter to correctly filter items #16

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Fix List.filter to correctly filter items #16

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5 changes: 3 additions & 2 deletions List.fm
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Original file line number Diff line number Diff line change
Expand Up @@ -57,9 +57,10 @@ filter(A; fn: A -> Bool, xs: List(A)) : List(A)
case xs
| nil => nil(_)
| cons => case fn(xs.head) as got
with fn : A -> Bool
with xs.tail : List(A)
| true => cons(_ xs.head, xs.tail)
| false => cons(_ xs.head, filter(_ fn, xs.tail))
| true => cons(_ xs.head, filter(_ fn, xs.tail))
| false => filter(_ fn, xs.tail)

// Returns the same list
sames(A; xs : List(A)) : List(A)
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