Local 'var' is never modified and can be declared as 'val'

Reports local variables declared with the var keyword that are never modified.

Kotlin encourages to declare practically immutable variables using the val keyword, ensuring that their value will never change.

Example:

  fun example() {
      var primeNumbers = listOf(1, 2, 3, 5, 7, 11, 13)
      var fibonacciNumbers = listOf(1, 1, 2, 3, 5, 8, 13)
      print("Same numbers: " + primeNumbers.intersect(fibonacciNumbers))
  }

The quick-fix replaces the var keyword with val:

  fun example() {
      val primeNumbers = listOf(1, 2, 3, 5, 7, 11, 13)
      val fibonacciNumbers = listOf(1, 1, 2, 3, 5, 8, 13)
      print("Same numbers: " + primeNumbers.intersect(fibonacciNumbers))
  }

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.

CanBeVal

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

Availability

By default bundled with: IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,
Can be installed with plugin: Kotlin, 241.18072-IJ

Last modified: 18 June 2024