No semicolon necessary

In Kotlin, a ; terminating a statement is not mandatory.

In contrast to Java and other languages, the Kotlin compiler usually recognizes the end of a statement even without an explicit ; - for example by a line break.

The general rule in Kotlin is not to use semicolons.

Two (marginal) exceptions should be noted:

Multiple expressions in the same line

If you want to note several statements in a single line, they are separated with ;.

val a = 42 ; println(a)

Semicolon after enum constants

If you want to add properties or functions to an enum class, you have to separate their constants with a ; from the rest of the body:

enum class Weekdays {
  MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY;

  fun isWeekend() = this == SATURDAY || this == SUNDAY
}