Swift--guard

Import UIKit

var str = "Hello, playground"

Func Checkup (person:[string:string]) {
Check the ID card, if the identity card is not brought, you cannot enter the examination room

Guardlet id = person["id"] else {

Print ("No ID, no access to the examination room")
Return

}

Check the admission ticket, if the admission ticket is not brought, you cannot enter the examination room
Guardlet Exanumber = person["Examnumber"] else {
Print ("No admission ticket, no entrance exam!")
Return
}


ID card and admission ticket is complete before you can enter the examination room

Print ("Your ID: \ (ID), admission ticket: \ (exanumber) Please enter the examination room")


}
Checkup (person: ["id": "123456"])
Checkup (Person: ["Examnumber": "654321"]) Checkup (person: ["id": "123456", "Examnumber": "654321"])

Swift--guard