Kotlin if表达式

习惯了Java中的三元运算符：() ? :，Kotlin中并没有这个，取而代之的是if表达式。

In Kotlin, if is an expression, i.e. it returns a value. Therefore there is no ternary operator (condition ? then : else), because ordinary if works fine in this role.

// Traditional usage 
var max = a 
if (a < b) max = b

// With else 
var max: Int
if (a > b) {
    max = a
} else {
    max = b
}
 
// As expression 
val max = if (a > b) a else b