Can be replaced with function reference

Reports function literal expressions that can be replaced with function references.

Replacing lambdas with function references often makes code look more concise and understandable.

Example:

  fun Int.isEven() = this % 2 == 0

  fun example() {
      val numbers = listOf(1, 2, 4, 7, 9, 10)
      val evenNumbers = numbers.filter { it.isEven() }
  }

After the quick-fix is applied:

  fun Int.isEven() = this % 2 == 0

  fun example() {
      val numbers = listOf(1, 2, 4, 7, 9, 10)
      val evenNumbers = numbers.filter(Int::isEven)
  }

Locating this inspection

By ID

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

ConvertLambdaToReference

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Kotlin | Style issues

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