October 2019
Intermediate to advanced
434 pages
11h 54m
English
Content preview from Mastering Kotlin
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Working with null
Kotlin aims to eliminate null and NullPointerException from your code. This is why types are non-null by default. Unfortunately, it's not always possible to avoid null, especially if working within a mixed Java plus Kotlin code base. There are sometimes scenarios where null might be a reasonable option to represent your data, or you might be working with an API that uses null. For these types of cases, there are several ways in which you can safely work with null types, such as the following ones:
- Safe calls
- Non-null assertion
- Conditionals
- The Elvis operator
- Safe casts
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.