Questions tagged [guard-statement]

guard is a conditional statement that requires execution to exit the current block if the condition isn’t met.

Syntax:

guard <condition> else {
    <statements>
}

The value of any condition in a guard statement must have a type that conforms to the BooleanType protocol, it can also be an optional binding declaration.

Any constants or variables assigned a value from an optional binding declaration in a guard statement condition can be used for the rest of the guard statement’s enclosing scope.

For example:

guard let value = someOptional else {
     // someOptional is nil, value is not accessible
     return
}

// do something with the value
// value is available here