Scala Stream

by Online Tutorials Library July 14, 2022

Scala Stream

Stream is a lazy list. It evaluates elements only when they are required. This is a feature of scala. Scala supports lazy computation. It increases performance of your program.

Scala Stream Example

In the following program, we have created a stream.

  object MainObject{      def main(args:Array[String]){          val stream = 100 #:: 200 #:: 85 #:: Stream.empty          println(stream)      }  }  

Output:

Stream(100, ?)

In the output, you can see that second element is not evaluated. Here, a question mark is displayed in place of element. Scala does not evaluate list until it is required.

Scala Stream Example: Applying Predefined Methods

In the following example, we have used some predefined methods like toStream, which is used to iterate stream elements.

  import scala.collection.immutable._  object MainObject{      def main(args:Array[String]){          var stream = 100 #:: 200 #:: 85 #:: Stream.empty          println(stream)          var stream2 = (1 to 10).toStream          println(stream2)          var firstElement = stream2.head          println(firstElement)          println(stream2.take(10))          println(stream.map{_*2})      }  }  

Output:

Stream(100, ?)  Stream(1, ?)  1  Stream(1, ?)  Stream(200, ?)

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Scala Stream

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Scala Stream Example

Scala Stream Example: Applying Predefined Methods

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