switch case let ... as

Swift ⟩ Pattern Matching ⟩ Sentence Patterns ⟩

💈範例

👉 比較： if let ... as?

// switch on "protocol type"
switch medium {
  case let b as Book : // ... ⭐️ 注意：這裡用的是 `as` 不是 `as?`
  case let m as Movie: // ...
  default: // ...
}

📗 參考

• AliSoftware ⟩ Pattern Matching

  • Part 1: switch, enums & where clauses

  • Part 2: tuples, ranges & types ⭐️

👥 相關

• if let ... as? - use as?.