UselessCallOnNotNull.md

Pattern: Redundant call on not null

Issue: -

Description

The Kotlin stdlib provides some functions that are designed to operate on references that may be null. These functions can also be called on non-nullable references or on collections or sequences that are known to be empty - the calls are redundant in this case and can be removed or should be changed to a call that does not check whether the value is null or not.

Example of incorrect code:

val testList = listOf("string").orEmpty()
val testList2 = listOf("string").orEmpty().map { _ }
val testString = ""?.isNullOrBlank()

Example of correct code:

val testList = listOf("string")
val testList2 = listOf("string").map { }
val testString = ""?.isBlank()

Further Reading

• Detekt - UselessCallOnNotNull