Control Flow
Switch Case in Swift
A switch case is used test variable equality for a list of values, where each value is a case. When the variable is equal to one of the cases, the statements following the case are executed.
In Swift, a switch case can contain a temporary let constant, which contains the variable's value. This let constant can be used in a booleanExpression, which if true, will evaluate statements
Syntax
switch variable {
//checking for value
case valueOne:
//statements
case valueTwo:
//statements
//using the let
case let variableValue where booleanExpression:
//statements
default: //executes if none of the above occur
//statements
}Notes
With a switch statement, the program goes through the conditions from top to bottom. If a condition is met, it executes the code and exits the block after. A fallthrough statement can be used other conditions need to be checked, even if a condition passes.
The switch statement can be used on strings, objects, and primitives.
Example
var choice = 'Y'
switch choice {
case 'Y':
print "Yes"
case 'N' :
print "No"
case let choiceValue where choiceValue == 'M':
print "It's a yes or no question, no maybe."
default:
print "Not a valid response"
}