While it seems ideal to never have null in your code, it’s not always possible to avoid, and sometimes shouldn’t be avoided.
Whether it is a REST API, or an Android System Service, representing data that may not be available as a nullable type is important because it allows us to create code paths to handle both cases. When operating in a non-hermetic environment, we run into cases where some data sources are not reliable and may provide null content. The only truth to understand what is happening. If you need a way to represent whether a value is available or unavailable, then null is appropriate in this case as well.Īpps must consume external data sources that we don’t have full control over. Kotlin scoped function for null Kotlin has improved the handling of null a lot, but this does not mean that we should forget its existence. If you need a way to represent whether a value is initialized or whether it has no value, then null is appropriate in this case. Valid usages of null in Kotlin 1) When Representing “No Value” var user: User? = null There are perfectly appropriate safe uses of null in Kotlin. Best Way to 'Refresh' LiveData Provided by Room Database. why Kotlin inline function params is must not be null. However, just because it’s easy to identify null in Kotlin doesn’t mean we should use it everywhere. Kotlin property not accessed when object loaded with JPA/Hibernate. Yes, it’s to be avoided in most code, but in Kotlin, null is part of the type system and the compiler will tell you when you haven’t handled it appropriately. I was recently reviewing code with a developer that is learning Kotlin and they were adamant that:
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