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Redundant 'Unit'

Reports redundant Unit expressions.

Unit in Kotlin can be used as the return type of functions that do not return anything meaningful. The Unit type has only one possible value, which is the Unit object.

Examples:

fun redundantA(): Unit { return Unit // redundant, 'Unit' is returned by default and matches the expected return type } fun requiredA(condition: Boolean): Any { if (condition) return "hello" return Unit // explicit 'Unit' is required since the expected type is 'Any' } fun redundantB(condition: Boolean): Any = if (condition) { fun ancillary(): Int = 1 println("${ancillary()}") Unit // redundant since the last expression is already of type 'Unit' } else { println("else") } fun requiredB(condition: Boolean): Any = if (condition) { 1024 Unit // required, otherwise '1024' (Int) would be the return value } else { println("else") }

Inspection Details

By default bundled with:

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin:

Kotlin, 241.16690-IJ

Last modified: 29 April 2024