July 2018
Intermediate to advanced
400 pages
12h 14m
English
Content preview from Kotlin Programming: The Big Nerd Ranch Guide, First Edition
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For the More Curious: A Closer Look at var and val Properties
In this chapter you learned that the var and val keywords are used when specifying a class property – var for writable, and val for read-only.
You may be wondering how a Kotlin class property works, under the hood, when targeting the JVM.
To understand how class properties are implemented, it is helpful to look at the decompiled JVM bytecode – specifically, to compare the bytecode generated for a single property depending on how it is specified. Create a new file called Student.kt. (You will delete this file after this exercise.)
First, define a class with a var property (which allows both reading and writing the class property).
Listing 12.23 Defining a Student ...
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I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.