Variable declaration could be moved inside 'when'

Reports variable declarations that can be moved inside a when expression.

Example:

fun someCalc(x: Int) = x * 42

fun foo(x: Int): Int {
  val a = someCalc(x)
  return when (a) {
    1 -> a
    2 -> 2 * a
    else -> 24
  }
}

After the quick-fix is applied:

fun foo(x: Int): Int {
  return when (val a = someCalc(x)) {
    1 -> a
    2 -> 2 * a
    else -> 24
  }
}

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.

MoveVariableDeclarationIntoWhen

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 2024.2, Qodana for JVM 2024.2,
Can be installed with plugin:	Kotlin, 242.22892-IJ

Last modified: 11 September 2024