This topic is about Scala Collections – Partition Method.
partition() method is a member of TraversableLike trait, it is used to run a predicate method on each elements of a collection. It returns two collections, one collection is of elements which satisfiles a given predicate function and another collection is of elements which do not satisfy the given predicate function.
Syntax
The following is the syntax of map method.
def partition(p: (A) ? Boolean): (Repr, Repr)
Here, partition method takes a prediate function as a parameter. This method returns the collections.
Usage
Below is an example program of showing how to use partition method −
Example
object Demo {
def main(args: Array[String]) = {
val list = List(1, 2, 3, 4, 5, 6, 7)
//apply operation to get twice of each element.
val (result1, result2) = list.partition(x=>{x % 3 == 0})
//print result
println(result1)
println(result2)
}
}
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) List(1, 2, 4, 5, 7)
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