tmp.swift

/*:
 # A Case of the Missing Unit Test */
/*:
 ### Type Defs
 */
struct Payload {
    let url: String
}

struct FetchListingsAction {
    let type: String
    let payload: Payload
}

struct Coordinates {
    let lat: Float
    let lng: Float
}

typealias Dispatcher = (
    fetchListings: (Int, Bool, String, Coordinates) -> Void,
    fetchBuildingSearchResults: () -> Void
)

struct Actions {
    let fetchListings: (Int, Bool, String, Coordinates) -> FetchListingsAction
}

struct Routes {
    let listing: (Int, Bool, String, Coordinates) -> String
}

/*:
 ### App Code
 */

let routes = Routes(
    listing: { (pageNumber: Int, neighborhoods: Bool, sort: String, mapCoordinates: Coordinates) -> String in
        return "/api/listings?pageNumber=\(pageNumber)&neighborhoods=\(neighborhoods)&sort=\(sort)&coordinates=\(mapCoordinates)"
    }
)

let actions = Actions(
    fetchListings: {(pageNumber, neighborhoods, sort, mapCoordinates) -> FetchListingsAction in
        return FetchListingsAction(
            type: "[Fetch] listings",
            payload: Payload(
                url: routes.listing(pageNumber, neighborhoods, sort, mapCoordinates)
            )
        )
    }
)

let mapDispatchToProps = {(dispatch: @escaping (FetchListingsAction) -> Void) -> Dispatcher in
    return (
        fetchListings: {(pageNumber, neighborhoods, sort, mapCoordinates) -> Void in
            dispatch(actions.fetchListings(
                pageNumber,
                neighborhoods,
                sort,
                mapCoordinates
            ))
        },
        
        fetchBuildingSearchResults: {}
    )
}

mapDispatchToProps({(action) in return}).fetchListings(0, true, "", Coordinates(lat: 0.0, lng: 0.0))

/*:
 ### Simplified Example
 */

typealias Fn1 = (String, Int, Bool) -> Void
typealias Fn2 = (String, Int, Bool) -> Void
typealias Fn3 = (String, Int, Bool) -> Void

let fn3: Fn3 = { (name, age, developer) in
    print("name: \(name), age: \(age), developer: \(developer)")
}

let fn2: Fn2 = { (name, age, developer) in
    return fn3(name, age, developer)
}

let fn1: Fn1 = { (name, age, developer) in
    return fn2(name, age, developer)
}