4/27/2023 0 Comments Kotlin if not null![]() ![]() If you checked your local variable and it’s not null, nothing in the world could make it null, so Kotlin compiler allows to treat is as a non-null value. A variable that is assigned null is like a bucket that is empty. Kotlin tries to provide null-safety even when the variable could be changed from another thread. ![]() ![]() However, the above program doesnt return. You can use it in combination with the Elvis operator. Kotlin uses a keyword called null to represent the absence of a value. In plain terms, if a string isnt a null and isEmpty() returns false, its not either null or empty. 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. 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 Insert the name of your app and Company domain name then select the include kotlin support checkbox to enable Kotlin in the project. Open android studio, create a new project. Creating our Android Project with Kotlin Support. length : - 1 // If b is not empty, return B. When you have created the Pusher app, we will move on to creating our Kotlin application. A structural equality a = b is translated to a?.equals(b) ?: (b = null) For the above example, what we often do in development is we return another value y when b is not null, and we return a value x instead of null when b is null, using the Elvis operator val l b. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |