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enum case pattern

Swift uses various overloads of the ~= operator to do pattern matching, which also lets us define our own overloads ... 👉 Sundell

💾 程式：paiza.io

⬆️ 需要：CaseReflectable

// ------------
//     Enum
// ------------

// enum with associated values
// (conforms to `CaseReflectable`)
enum Enum: CaseReflectable {
    case int(Int)
    case int2(Int)
    case person(name: String, age: Int)
    case str(String)
}

// ------------
//     main
// ------------

let a: Enum = .int(3)

Enum.int ~= a        // true
Enum.int2 ~= a       // false

let joe = Enum.person(name: "joe", age: 8)

Enum.person ~= joe   // true
Enum.int ~= joe      // false

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Last updated 4 years ago