Prefer val Over var

It may seem that var is more useful than val. After all, a val can only hold one value, whereas we can reassign values to a var as needed.

Yet you will find that the vast majority of Kotlin code uses val. If anything, var tends to be considered as a “workaround”, for cases where val cannot be used for one reason or another.

We will hold off on a detailed explanation of this philosophy, and we will return to this point later in the book. For the moment, take it on faith that we have good reasons to prefer val over var, and that is why this book will be using val much more than var.