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Kotlin Programming: The Big Nerd Ranch Guide, First Edition
book

Kotlin Programming: The Big Nerd Ranch Guide, First Edition

by Josh Skeen, David Greenhalgh
July 2018
Intermediate to advanced content levelIntermediate to advanced
400 pages
12h 14m
English
Big Nerd Ranch Guides
Content preview from Kotlin Programming: The Big Nerd Ranch Guide, First Edition

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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Publisher Resources

ISBN: 9780135165188