if let ... as?

Swift ⟩ Pattern Matching ⟩ Sentence Patterns ⟩

• let: variable binding.

• as?: optional binding.

💈範例

💾 程式： Mirror.handleChildren() 👉 比較： switch case let ... as

// ⭐ `if let ... as?` (optional binding)
if let resettable = child.value as? Resettable {
    resettable.reset()
}

👥 相關

• Mirror.handleChildren() - use if let ... as? sentence pattern.

• switch case let ... as - use as.