Collections & Sequences

CollectionsAndSequences.kt

fun main() {
    smallList()
    smallSequence()
}

fun smallList() = (0..5)
    .filter { print("list filter($it) "); it % 2 == 0 }
    .map { print("list map($it) "); it * it }
    .first()

fun smallSequence() = (0..5)
    .asSequence()
    .filter { print("seq filter($it) "); it % 2 == 0 }
    .map { print("seq map($it) "); it * it }
    .first()

// output
list filter(0) list filter(1) list filter(2) list filter(3) list filter(4) list filter(5) list map(0) list map(2) list map(4) 11 ms
seq filter(0) seq map(0) 6 ms