Inspectopedia Help

Argument could be converted to 'Set' to improve performance

Detects the function calls that could work faster with an argument converted to Set.

Operations like 'minus' or 'intersect' are more effective when their argument is a set. An explicit conversion of an Iterable<T> or an Array<T> into a Set<T> can often make code more effective.

The quick-fix adds an explicit conversion to the function call.


fun <T> f(a: Iterable<T>, b: Iterable<T>): Int = a.intersect(b).size

After the quick-fix is applied:

fun <T> f(a: Iterable<T>, b: Iterable<T>): Int = a.intersect(b.toSet()).size

Locating this inspection


Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

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 | Other problems


By default bundled with

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin

Kotlin, 241.18072-IJ

Last modified: 18 June 2024