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.

Example:

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

After the quick-fix is applied:

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

Locating this inspection

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Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

RedundantAsSequence

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Inspection Details
By default bundled with:	IntelliJ IDEA 2024.3, Qodana for JVM 2024.3,
Can be installed with plugin:	Kotlin, 243.23126-IJ

Last modified: 03 December 2024