Kotlin Blueprints

Elvis operator (?:)

Many times we simply write an if condition to handle null check and return some static value if it is null. Kotlin has a solution to this stereotype code as well. It has an Elvis operator. An Elvis operator returns the alternate value if the object is found to be null:

    var fileName:String?=null    val file= File(fileName?:"untitled.txt")

The preceding code will create a file with the name untitled.txt if the fileName string object is found null at the time of creating the file.