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

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.

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.

i := getNumber()

switch {
case i == 0:
  // ...
case i == 1:
  // ...
default:
  // ...
}

// Same as
switch true {
  // ...
}