> For the complete documentation index, see [llms.txt](https://www.selinux.tech/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.selinux.tech/scala/function-operation/m/map.md).

# map

## definition

```scala
def map[B](f: (A) ⇒ B): Traversable[B]
```

## demo

```scala
val donuts1: Seq[String] = Seq("Plain", "Strawberry", "Glazed")

val donuts2: Seq[String] = donuts1.map(_ + " Donut")

val donuts3: Seq[AnyRef] = Seq("Plain", "Strawberry", None)

val donuts4: Seq[String] = donuts3.map {
 case donut: String => donut + " Donut"
 case None => "Unknown Donut"
}
```