Scala Collections Tutorial
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Scala Collections - filter
Scala Collections - Filter Method
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 appped on each element of the pst. This method returns the all the elements of pst 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 pst = List(3, 6, 9, 4, 2)
// print pst
println(pst)
//apply operation
val result = pst.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)Advertisements