Then

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Promise A+ in Swift

Usage

To run the example project, clone the repo, and run pod install from the Example directory first.

Features

• Use Result to associate states with values
• Support protocol Thenable
• Support queue
• Transform Fulfilled value

Then

let promise = Promise<Int>()

promise.then { result in
    var condition = false
    if case let .Fulfilled(value) = result where value == 10 {
        condition = true
    }

    XCTAssert(condition)

    return nil
} as Promise<Any>

promise.fulfill(value: 10)

Chain

let promise = (Promise<String>(result: .Fulfilled(value: "then"))
    .then { result in
        return result.map { value in
            return value.characters.count
        }
    } as Promise<Int>)
    .then { result in
        return result.map { value in
            return value * 2
        }
    } as Promise<Int>

promise.then { result in
    if case let .Fulfilled(value) = result {
        XCTAssert(value == 8)
    } else {
        XCTAssert(false)
    }

    return nil
} as Promise<Any>
}

All

let promise1 = Promise<Int>(result: .Fulfilled(value: 1))
let promise2 = Promise<Int>(result: .Fulfilled(value: 2))
let promise3 = Promise<Int>(result: .Fulfilled(value: 3))

let final = Promise.all(promises: [promise1, promise2, promise3])

final.then { result in
    if case let .Fulfilled(value) = result {
        XCTAssert(value.count == 3)

        XCTAssert(value.values.contains(1))
        XCTAssert(value.values.contains(2))
        XCTAssert(value.values.contains(3))

        XCTAssert(value.keys.contains(promise1.key))
    } else {
        XCTAssert(false)
    }

    return nil
} as Promise<Any>

Installation

Then is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'Then', git: 'https://github.com/onmyway133/Then'

Author

Khoa Pham, onmyway133@gmail.com

License

Then is available under the MIT license. See the LICENSE file for more info.