October 2021
Intermediate to advanced
500 pages
16h 23m
English
Content preview from Kotlin Programming: The Big Nerd Ranch Guide, 2nd Edition
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7 Null Safety and Exceptions
Some elements in Kotlin can be assigned a value of null. Null is a special value; in fact, it indicates that the value of an element does not exist. In many programming languages, null is a common cause of crashes and errors, because a nonexistent value cannot be asked to do anything. Kotlin has several language features that force programmers to be mindful of null values in their programs, which helps avoid those crashes.
In this chapter, you will learn why null causes a crash, how Kotlin protects against null by default at compile time, and how to safely work with values that could be null when you need them. You will also see how to work with exceptions in Kotlin: indicators that something went wrong ...
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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.