... as! ...

Swift ⟩ Pattern Matching ⟩ Sentence Patterns ⟩

• as!: force type casting.

💈範例

💾 程式： Mirror.handleChildren()

// mirror self
let mirror = Mirror(reflecting: self)

//            ↱ child.label ignored        ╭─── ⭐ where clause ────╮
for case let (_, value) in mirror.children where value is Resettable {

    // ⭐ `as!` force type casting (from Any to Resettable)
    //    "where clause" ensures `value` IS `Resettable`!
    (value as! Resettable).reset()
}

👥 相關

• Mirror.handleChildren() - use (... as! ...) sentence pattern.