CODEWITHSUNDEEP
swiftpromise
Jaythaking
Jaythaking

Reputation: 2102

Parallel task using Promise in Swift

I'm a bit confuse about the difference between Promises.zip and Promises.all in this Promise Library

Which one should I use if I want to execute 2 task in parallel and then use both their result for another task?

Upvotes: 0

Views: 306

Answers (1)

pacification
pacification

Reputation: 6018

If you look at implementation of Promises.all and Promises.zip you see, that .all can work with Promises with same type:

public static func all<T>(_ promises: [Promise<T>]) -> Promise<[T]>

But .zip can work with different types:

public static func zip<T, U>(_ first: Promise<T>, _ second: Promise<U>) -> Promise<(T, U)>

This is basic difference between these two.

P.S. Also, if you try to search in github by zip keyword, you can find this issue, that helps you to understand the situation. So, always search first ;)

Upvotes: 2

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