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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.

Example:

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

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