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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Compile-Time Constants
Earlier we told you that vars can have their values changed and vals cannot.
That … was a white lie.
In fact, there are special cases where a val can return different values, which we will discuss in Chapter 12.
If you have a piece of data that you want to be absolutely, positively immutable – to never change – consider a compile-time constant.
A compile-time constant must be defined outside of any function, including main, because its value must be assigned at compile time (that is, when the program compiles) – hence the name. main and your other functions are called during runtime (when the program is executed), and the variables within them are assigned their values then. A compile-time constant exists before ...
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