MapGetWithNotNullAssertionOperator.md

Pattern: Use of map[]/map.get() with !!

Issue: -

Description

Reports calls of the map access methods map[] or map.get() with a not-null assertion operator !!. This may result in a NullPointerException. Preferred access methods are map[] without !!, map.getValue(), map.getOrDefault() or map.getOrElse().

Example of incorrect code:

 val map = emptyMap<String, String>()
 map["key"]!!

 val map = emptyMap<String, String>()
 map.get("key")!!

Example of correct code:

val map = emptyMap<String, String>()
map["key"]

val map = emptyMap<String, String>()
map.getValue("key")

val map = emptyMap<String, String>()
map.getOrDefault("key", "")

val map = emptyMap<String, String>()
map.getOrElse("key", { "" })

Further Reading

• Detekt - MapGetWithNotNullAssertionOperator