Duplicate arguments in 'setOf' and 'mapOf' functions

Reports duplicate constant elements in set factory functions and duplicate constant keys in map factory functions.

Duplicate entries in collection factory functions are often unintended and may indicate a bug or typo. In set factory functions, duplicate elements are ignored because sets can contain only unique elements. In map factory functions, entries with the same key overwrite earlier entries, and only the last value associated with the key is retained.

The inspection applies to the following map factory functions:

• mapOf()

• mutableMapOf()

• hashMapOf()

• linkedMapOf()

• sortedMapOf()

Duplicate map keys are detected for entries created using the to operator.

The inspection applies to the following set factory functions:

• setOf()

• mutableSetOf()

• hashSetOf()

• linkedSetOf()

• sortedSetOf()

The inspection reports arguments whose values can be evaluated as compile-time constants, including constant literals and references.

Examples:

The value 1 appears multiple times.

Both entries use the same key.

Example with const val:

Both arguments evaluate to the same constant value.

Inspection ID: DuplicateArgumentsInSetOfAndMapOfFunctions