Swift Tuples & Type Aliases

Swift Tuples & Type Aliases

Group values into lightweight records with tuples, and name complex types using typealias for clarity.

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Tuples

Tuples bundle multiple values into a single compound value without defining a struct.

Syntax:

• let user: (String, Int) = ("Morgan", 30)
• labels: (name: String, age: Int)

Example

let user: (name: String, age: Int) = ("Morgan", 30)
print(user.name)
print(user.age)

let http: (code: Int, message: String) = (200, "OK")
let (code, msg) = http
print(code)
print(msg)

This example creates labeled tuples, accesses fields by name, and destructures into separate variables.

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Type Aliases

Give a readable name to an existing type using typealias.

Syntax: typealias Completion = (Result<Void, Error>) -> Void

Example

typealias JSON = [String: Any]
typealias Completion = (Result<Void, Error>) -> Void

func parse(_ data: Data) -> JSON { return [:] }

func save(completion: Completion) {
  completion(.success(()))
}