You can use it in combination with the Elvis operator. By default, Kotlin assumes that value cannot be null: var a: String 'value' assertEquals (a. But you use such functions in Kotlin from the standard library by default. Kotlin has two types of references that are interpreted by the compiler to give the programmer information about the correctness of a program at compile time those that are nullable and those that are not. Specifically for this task, I have to swap the name in order to let you implement it yourself.

Note that if the variable is a mutable property, you won't be able to smart cast it to its non-nullable type inside the if statement (because the value might have been modified by another thread) and you'd have to use the safe call operator with let instead. BLE in Android-Kotlin BLE (Bluetooth Low Energy) devices are using to get a small amount of. The library actually contains functions isNullOrEmpty, and isNullOrBlank, which checks whether string is null, or empty, or blank. it returns the value of a variable if the variable is not null. Therefore when comparing to null, the structural equality a = null is translated to a referential equality a = null.Īccording to the docs, there is no point in optimizing your code, so you can use a = null and a != null Nullability is very simple but too verbose to use, So kotlin provides the safe call operator.

A structural equality a = b is translated to a?.equals(b) ?: (b = null)

Kotlin is null