February 2018
Intermediate to advanced
350 pages
7h 35m
English
Content preview from Functional Kotlin
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The (!!) operator
Instead of a null value, the !! operator will throw an NPE:
val result: String = nullableCupcake!!.eat()
If you can deal with an NPE, the !! operator gives you a pretty convenient feature, a free smart cast:
val result: String = nullableCupcake!!.eat()val length: Int = nullableCupcake.eat().length
If nullableCupcake!!.eat() doesn't throw an NPE, Kotlin will change its type from Cupcake? to Cupcake from the next line and onwards.
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