![]() This is because the value passed to the lambda inside the let method will not change even if the original variables changes its value that will make your block much safer in this particular case. ![]() It’s also worth mentioning that if you are working with mutable variables (something I would NOT recommend), using let is safer than using an if condition. That looks concise and clean there could be some arguments against it due to not being “human-readable” but I can promise that once you get used to the use of safe calls and let methods you’ll read it clearly with no effort. If we take the example we used in our last Kotlin article about Either: fun findEmployeeByName(name: String): Either ") Not always, we might have a findEmployee method in our service where we want to express the possibility of not finding the employee by using a nullable type. In this article, we’ve taken a look at different ways we can default a null value for a non-optional parameter. That’s definitely the best way to avoid having to deal with nulls in our language, although is this always possible? If you have a String that cannot be null, you can always use it where a nullable String is required. This is the way that they decided to achieve null-safety in Kotlin. In the Kotlin type system, T is a subtype of T. val dialog: Dialog Dialog() dialog.dismiss() // If the dialog is null, the dismiss call will be omitted Let function. Non-Nullable Types in Kotlinīy default Kotlin types are not nullable, what means that it’s impossible to assign null to them. Kotlin provides different mechanisms to help solve this problem. In this article you will learn how to handle nullable types in Kotlin correctly. Kotlin supports this possibility since its first release, and it is called null safety. Nullable and Non-Nullable Type Kotlin aims at eliminating the risk of NullPointerException. ![]() ![]() It has been referred to as a billion-dollar mistake. Any programming language which has the concept of null reference throws a NullPointerException. Having to place null check conditions everywhere just to make our code null-safe is something that probably most of us have suffered quite often. Overview In this article, we’ll look into the handling of null references in Kotlin. One of the most annoying aspects in writing code in Java is dealing with null elements. ![]()
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