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Replace 'until' with '..<' operator

Reports until that can be replaced with ..< operator.

Every until to ..< replacement doesn't change the semantic in any way.

The UX research shows that developers make ~20-30% fewer errors when reading code containing ..< compared to until.


fun main(args: Array<String>) { for (index in 0 until args.size) { println(index) } }

After the quick-fix is applied:

fun main(args: Array<String>) { for (index in 0..<args.size) { println(index) } }

This inspection only reports if the Kotlin language level of the project or module is 1.7 or higher.

Inspection Details

Available in:

IntelliJ IDEA 2023.3, Qodana for JVM 2023.3


Kotlin, @snapshot@

Last modified: 13 July 2023