filter() method is method used by List to select all elements which satisfies a given predicate.
Syntax
The following is the syntax of filter method.
def filter(p: (A) => Boolean): List[A]
Here, p: (A) => Boolean is a predicate or condition to be applied on each element of the list. This method returns the all the elements of list which satisfiles the given condition.
Usage
Below is an example program of showing how to use filter method −
Example
object Demo { def main(args: Array[String]) = { val list = List(3, 6, 9, 4, 2) // print list println(list) //apply operation val result = list.filter(x=>{x % 3 == 0}) //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(3, 6, 9, 4, 2) List(3, 6, 9)