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Go - Switch Statement

The switch statement is a shorter way to write a sequence of if-else statements:

  • The switch cases are evaluated from top to bottom, stopping when a case succeeds
  • The first case expression that equals the swicth expression will be executed
  • The break statement is not needed at the end of each case like other languages
go
i := getNumber()
switch i {
case 0:
// ...
case 1:
// ...
default:
// Default code to execute if no cases match
}

Simple Statement

The switch expression may be preceded by a simple statement which executes before the expression is evaluated.

go
switch i := getNumber(); i {
case 0:
// Variables will be only in the scope of the switch statement
default:
// ...
}

Switch Without a Condition

The switch statement without a condition can be a clean way to write long if-else chains.

go
i := getNumber()
switch {
case i == 0:
// ...
case i == 1:
// ...
default:
// ...
}
// Same as
switch true {
// ...
}