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)
      }
  }

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.

ReplaceUntilWithRangeUntil

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

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

Last modified: 18 June 2024