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Redundant 'asSequence' call

Reports redundant asSequence() call that can never have a positive performance effect.

asSequence() speeds up collection processing that includes multiple operations because it performs operations lazily and doesn't create intermediate collections.

However, if a terminal operation (such as toList()) is used right after asSequence(), this doesn't give you any positive performance effect.


fun test(list: List<String>) { list.asSequence().last() }

After the quick-fix is applied:

fun test(list: List<String>) { list.last() }

Inspection Details

Available in:

IntelliJ IDEA 2023.3, Qodana for JVM 2023.3


Kotlin, @snapshot@

Last modified: 13 July 2023