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Add foldr note to Foldable doc #4425

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Apr 24, 2023
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Add foldr note to Foldable doc #4425

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9 changes: 9 additions & 0 deletions docs/typeclasses/foldable.md
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Expand Up @@ -126,3 +126,12 @@ after looking at only one value:
```scala mdoc
Foldable[LazyList].foldRight(allFalse, Eval.True)((a,b) => if (a) b else Eval.False).value
```

Unfortunately, since `foldRight` is defined on many collections - this
extension clashes with the operation defined in `Foldable`.
To get past this and make sure you're getting the lazy `foldRight` defined
in `Foldable`, there's an alias `foldr`:

```scala mdoc
allFalse.foldr(Eval.True)((a,b) => if (a) b else Eval.False).value
```