Use `guard` when a condition must hold for the rest of the function. Its `else` block must exit the current scope: ```swift func displayName(for user: User?) -> String { guard let user else { return "Anonymous" } guard !user.name.isEmpty else { return "Unnamed" } return user.name } ``` This keeps the happy path unindented and makes precondition failures explicit. Prefer it to deeply nested `if let` statements; use `if let` when the optional value is needed only in a small branch.
Scanned 9/5/2026
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Use `guard` when a condition must hold for the rest of the function. Its `else` block must exit the current scope:
```swift
func displayName(for user: User?) -> String {
guard let user else { return "Anonymous" }
guard !user.name.isEmpty else { return "Unnamed" }
return user.name
}
```
This keeps the happy path unindented and makes precondition failures explicit. Prefer it to deeply nested `if let` statements; use `if let` when the optional value is needed only in a small branch.
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