Kotlin Sequence

Result.md

List Test:

Map Human(name=Stefan, age=12)
Map Human(name=Amy, age=1)
Filter Stefan
Filter Amy
[Stefan]

Sequence Test:

Map Human(name=Stefan, age=12)
Filter Stefan
Map Human(name=Amy, age=1)
Filter Amy
[Stefan]

List Performance:

Map Human(name=Stefan, age=12)
Map Human(name=Amy, age=1)
Stefan

Sequence Performance:

Map Human(name=Stefan, age=12)
Stefan

Test.kt

class Test {

    data class Human(val name: String, val age: Int)

    @Test
    fun list() {
        val toList = listOf(Human("Stefan", 12), Human("Amy", 1))
                .map { println("Map $it"); it.name }
                .filter { println("Filter $it"); it.startsWith("S") }

        println(toList)
    }

    @Test
    fun sequence() {
        val toList = listOf(Human("Stefan", 12), Human("Amy", 1)).asSequence()
                .map { println("Map $it"); it.name }
                .filter { println("Filter $it"); it.startsWith("S") }
                .toList()

        println(toList)
    }
  
    @Test
    fun list_performance() {
        val toList = listOf(Human("Stefan", 12), Human("Amy", 1))
                .map { println("Map $it"); it.name }
                .first { it.startsWith("S") }

        println(toList)
    }

    @Test
    fun sequence_performance() {
        val toList = listOf(Human("Stefan", 12), Human("Amy", 1)).asSequence()
                .map { println("Map $it"); it.name }
                .first { it.startsWith("S") }

        println(toList)
    }  

}