Non-idiomatic 'is' type check for an object

Reports non-idiomatic is type checks for an object.

It's recommended to replace such checks with reference comparison.

Example:

  object Foo

  fun foo(arg: Any) = when {
      arg is Foo -> ...
      arg !is Foo -> ...
  }

After the quick-fix is applied:

  object Foo

  fun foo(arg: Any) = when {
      arg === Foo -> ...
      arg !== Foo -> ...
  }

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.

RedundantObjectTypeCheck

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, 243.26483-IJ

01 April 2025