February 2018
Intermediate to advanced
350 pages
7h 35m
English
Content preview from Functional Kotlin
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Safe calls
Safe calls let you access methods and properties of nullable values if the value isn't null (under the hood, at the bytecode level, a safe call is transformed into if(x != null)):
nullableCupcake?.eat()
But, what if you use it in an expression?
val result: String? = nullableCupcake?.eat()
It will return null if our value is null, so result must have a String? type.
That opens up the chance to use safe calls on a chain, as follows:
val length: Int? = nullableCupcake?.eat()?.length
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