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Rule priority, scope & exceptions
Use this to align rules with the senior-level structure (P0/P1/P2, scope, exceptions/tradeoffs).
mobile ruleP0stack specificStack: swift
swiftoptionalscrashnull-safety
Never force-unwrap optionals with ! outside tests
Force-unwrapping an optional crashes when it's nil; bind with if let / guard let or coalesce with ?? instead.
PR: mobile-canon-2026-06Created: Jul 5, 2026
Bad example
Old codeswift
| 1 | let name = user.name! |
Explanation (EN)
Objašnjenje (HR)
Good example
New codeswift
| 1 | guard let name = user.name else { return } |
Explanation (EN)
Objašnjenje (HR)