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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The Kotlin Type Hierarchy
If you do not specify a class to extend from, your class implicitly descends from a common superclass called Any. This means that every type in the language eventually extends from Any. In the case of your TownSquare class, the class hierarchy looks like Figure 15.2:
Figure 15.2 TownSquare type hierarchy
You can also use Any to define functions that accept any type of argument. Suppose that in NyetHack there are two things that can be a source of blessings: a blessed player or the room called The Fount of Blessings. A printIsSourceOfBlessings function, which checks and prints whether an object ...
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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.