This topic is about Scala Collections – Map Method.
map() method is a member of TraversableLike trait, it is used to run a predicate method on each elements of a collection. It returns a new collection.
Syntax
The following is the syntax of map method.
def map[B](f: (A) ? B): Traversable[B]
Here, map method takes a prediate function as a parameter. This method returns the updated collection.
Usage
Below is an example program of showing how to use map method −
Example
object Demo {
def main(args: Array[String]) = {
val list = List(1, 2, 3 ,4)
//apply operation to get twice of each element.
val result = list.map(_ * 2)
//print result
println(result)
}
}
Save the above program in Demo.scala. The following commands are used to compile and execute this program.
Command
\>scalac Demo.scala \>scala Demo
Output
List(2, 4, 6, 8)
In this topic we learned about Scala Collections – Map Method. To know more, Click Here.