Scala Collections Tutorial
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Scala Collections - foldRight
Scala Collections - FoldRight Method
foldRight() method is a member of TraversableOnce trait, it is used to collapse elements of collections. It navigates elements from Right to Left order.
Syntax
The following is the syntax of foldRight method.
def foldRight[B](z: B)(op: (B, A) ? B): B
Here, fold method takes associative binary operator function as a parameter. This method returns the resulted value.
Usage
Below is an example program of showing how to use foldRight method −
Example
object Demo {
def main(args: Array[String]) = {
val pst = List(1, 2, 3 ,4)
//apply operation to get sum of all elements of the pst
val result = pst.foldRight(0)(_ + _)
//print result
println(result)
}
}
Here we ve passed 0 as initial value to foldRight function and then all values are added. 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
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