When we run program code, we deal with expressions and statements all the time. It's very important to understand the difference between these. Let's look at the following code:

1 + 1

This code is an expression because it contains variables, operators, and returns a single result. If a standalone element of program code represents an action, it is a statement:

println("Hello")

In the context of this section, the main point for us is that an expression returns something. In Kotlin, the try { ... } catch { ... } finally { ... } block is an expression and we can write something like this:

fun loadValue(): Int = throw Exception()

fun main(args: Array<String>) {
    println(try { loadValue() } catch (exception: Exception) { 4 })
}

Under the hood, this code works in the same way as if we were to write it in Java. To check this...