#️discardable result

Swift ⟩ basic types ⟩ function ⟩ return value ⟩ discardable

// ⭐️ to silence the compiler from warning

// 1. use @discardableResult at declaration (compile-time)
@discardableResult        
func f() -> Int { ... }

// 2. use _ at call site (run-time)
let _ = g();

📗 參考

• SwiftLee ⟩ @discardableResult in Swift explained: Ignoring return values

• Sarun ⟩ What is @discardableResult

• Paul ⟩ How to ignore return values using @discardableResult

💈範例

• example in fully qualified name