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Add
map(to:) Operator (CombineCommunity#126)
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,22 @@ | ||
| // | ||
| // MapTo.swift | ||
| // CombineExt | ||
| // | ||
| // Created by Dan Halliday on 08/05/2022. | ||
| // Copyright © 2022 Combine Community. All rights reserved. | ||
| // | ||
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| #if canImport(Combine) | ||
| import Combine | ||
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| @available(OSX 10.15, iOS 13.0, tvOS 13.0, watchOS 6.0, *) | ||
| public extension Publisher { | ||
| /// Replace each upstream value with a constant. | ||
| /// | ||
| /// - Parameter value: The constant with which to replace each upstream value. | ||
| /// - Returns: A new publisher wrapping the upstream, but with output type `Result`. | ||
| func map<Result>(to value: Result) -> Publishers.Map<Self, Result> { | ||
| map { _ in value } | ||
| } | ||
| } | ||
| #endif |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,32 @@ | ||
| // | ||
| // MapToTests.swift | ||
| // CombineExt | ||
| // | ||
| // Created by Dan Halliday on 08/05/2022. | ||
| // Copyright © 2022 Combine Community. All rights reserved. | ||
| // | ||
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| import Foundation | ||
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| #if !os(watchOS) | ||
| import XCTest | ||
| import Combine | ||
| import CombineExt | ||
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| @available(OSX 10.15, iOS 13.0, tvOS 13.0, watchOS 6.0, *) | ||
| final class MapToTests: XCTestCase { | ||
| private var subscription: AnyCancellable! | ||
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| func testMapToConstantValue() { | ||
| let subject = PassthroughSubject<Int, Never>() | ||
| var result: Int? = nil | ||
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| subscription = subject | ||
| .map(to: 2) | ||
| .sink(receiveValue: { result = $0 }) | ||
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| subject.send(1) | ||
| XCTAssertEqual(result, 2) | ||
| } | ||
| } | ||
| #endif |