if and guard in Swift

guard bails early so the happy path stays unindented.

func briefing(windKts: Int) -> String {
    // guard exits early and keeps the happy path unindented.
    guard windKts > 4 else {
        return "Postponed: not enough wind"
    }
    if windKts > 25 {
        return "Small craft advisory: race abandoned"
    } else if windKts > 15 {
        return "Reef early, \(windKts) kts gusting"
    }
    return "Fair racing in \(windKts) kts"
}

print(briefing(windKts: 3))
print(briefing(windKts: 18))
print(briefing(windKts: 9))

How it works

1. guard windKts > 4 else { return ... } handles the bad case first.
2. if / else if chains handle the graded conditions.
3. Every path returns a string — the compiler checks.

Keywords and builtins used here

• Int
• String
• briefing
• else
• func
• guard
• if
• print
• return

The run, in numbers

Lines

16

Characters to type

422

Tokens

84

Three-star pace

70 tpm

At the three-star pace of 70 tokens a minute, this run takes about 72 seconds.

Type this snippet

Step 1 of 3 in Control flow, step 4 of 27 in Language basics.

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