(... as? ...)?.method()

Swift ⟩ Pattern Matching ⟩ Sentence Patterns ⟩

• as?: optional binding.

• ()?.method(): optional chaining.

💈範例

💾 程式： Mirror.handleChildren()

// ⭐ `(... as? ...)?.method()` (optional chaining)
for child in mirror.children {
    (child.value as? Resettable)?.reset()
}

👥 相關

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