Created
January 12, 2022 11:11
-
-
Save pofat/91faa5381b18693eeaec2b63693d6f62 to your computer and use it in GitHub Desktop.
[Effect<Output, Failure>] -> Effect<[Output], Failure>
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
extension Effect { | |
// Zip with other effects | |
func zip<Others: Collection>(with others: Others) | |
-> Effect<[Output], Failure> | |
where Others.Element == Effect<Output, Failure> { | |
let first = map { [$0] } | |
.eraseToEffect() | |
return others | |
.reduce(first) { zipped, next in | |
zipped | |
.zip(next) | |
.map { $0.0 + [$0.1] } | |
.eraseToEffect() | |
} | |
.eraseToEffect() | |
} | |
} | |
// Use this for effect array | |
func zip<Output, Failure: Error>(_ effects: [Effect<Output, Failure>]) -> Effect<[Output], Failure> { | |
switch effects.count { | |
case 0: | |
return .none | |
case 1: | |
return effects[effects.startIndex].zip(with: [Effect<Output, Failure>]()) | |
default: | |
let first = effects[effects.startIndex] | |
let others = effects[effects.index(after: effects.startIndex)...] | |
return first.zip(with: others) | |
} | |
} | |
// Usage | |
let first = Effect<Int, Never>(value: 1) | |
let second = Effect<Int, Never>(value: 2) | |
let third = Effect<Int, Never>(value: 3) | |
let forth = Effect<Int, Never>(value: 4) | |
let zipped = zip([first, second, third, forth]) // Effect<[Int], Never> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment