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Merged
mtj0928 merged 1 commit into from
Jan 1, 2026
Merged

Optional Support #15

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23 changes: 23 additions & 0 deletions Sources/AsyncOperations/Optional/Optional+asyncMap.swift
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Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
extension Optional {
/// An async function of `map`.
/// - Parameter transform: A similar closure with `map`'s one, but it's async.
/// - Returns: A transformed optional.
public func asyncMap<T>(_ transform: (Wrapped) async throws -> T) async rethrows -> T? {
guard let value = self else {
return nil
}

return try await transform(value)
}

/// An async function of `flatMap`.
/// - Parameter transform: A similar closure with `flatMap`'s one, but it's async.
/// - Returns: A transformed optional.
public func asyncFlatMap<T>(_ transform: (Wrapped) async throws -> T?) async rethrows -> T? {
guard let value = self else {
return nil
}

return try await transform(value)
}
}
44 changes: 44 additions & 0 deletions Tests/AsyncOperationsTests/Optional/OptionalAsyncMap.swift
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import Testing
import AsyncOperations

struct OptionalAsyncMap {
@Test
func asyncMap() async throws {
let nonSendable: NonSendable? = NonSendable()
let result = await nonSendable.asyncMap { $0.number + 1 }
#expect(result == 1)
}

@Test
func asyncMapForNilCase() async throws {
let nonSendable: NonSendable? = nil
let result = await nonSendable.asyncMap { $0.number + 1 }
#expect(result == nil)
}

@Test
func asyncFlatMap() async throws {
let nonSendable: NonSendable? = NonSendable()
let result = await nonSendable.asyncFlatMap { $0.number + 1 }
#expect(result == 1)
}

@Test
func asyncFlatMapForNilCase() async throws {
let nonSendable: NonSendable? = nil
let result = await nonSendable.asyncFlatMap { $0.number + 1 }
#expect(result == nil)
}

@Test
func asyncFlatMapForNilNilCase() async throws {
let nonSendable: NonSendable? = NonSendable()
let result: Int? = await nonSendable.asyncFlatMap { _ in nil }
#expect(result == nil)
}
}


private class NonSendable {
var number = 0
}