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Dec 9, 2022
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Add code tabs for _overviews/scala3-book/types-intersection.md #2653

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10 changes: 9 additions & 1 deletion _overviews/scala3-book/types-intersection.md
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Expand Up @@ -7,12 +7,16 @@ num: 50
previous-page: types-generics
next-page: types-union
---

<span class="tag tag-inline">Scala 3 only</span>

Used on types, the `&` operator creates a so called _intersection type_.
The type `A & B` represents values that are **both** of the type `A` and of the type `B` at the same time.
For instance, the following example uses the intersection type `Resettable & Growable[String]`:

{% tabs intersection-reset-grow %}

{% tab 'Scala 3 Only' %}

```scala
trait Resettable:
def reset(): Unit
Expand All @@ -25,6 +29,10 @@ def f(x: Resettable & Growable[String]): Unit =
x.add("first")
```

{% endtab %}

{% endtabs %}

In the method `f` in this example, the parameter `x` is required to be *both* a `Resettable` and a `Growable[String]`.

The _members_ of an intersection type `A & B` are all the members of `A` and all the members of `B`.
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