Pattern matching works really well with one sided ranges in switch statements, but you should be mindful of the one hitch that it has.

While writing a switch case, be careful to add a default case since you have to make your switch case exhaustive and since one sided ranges are infinite now, adding a default case becomes mandatory:

let selectedNumber = 7
switch selectedNumber {
    case ..<0 : 
        print("You have selected a negative number.")
    case 0... : 
        print("You have selected a positive number")
    default : 
        break
}

Here, note that we have already covered all the scenarios in the first 2 cases:

• Case 1: All negative numbers up to -1
• Case 2: All positive numbers from 0 onward

Hence, we simply break out the switch statement in the default case.