Question 69314 in IOS Swift Question posted in
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Most efficient way to remove these objects – Ios swift

I’m trying to loop through a set of Users, and remove them from another set LostFollowers (if they exist). Users are identifiable by id.

struct LostFollower {
  let user: User
  let dateLost: Date
}

let users1: Set<LostFollower> = // …
let users2: Set<User> = // …

users2.forEach { user in
  // Need to remove anyone in the set users1, whose `user` property is equal to user
}

How can I do this? Will I need to use filter or is there a better way to do it?

Note: Set operations won’t work because users1 and users2 are of different types.

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2

Answers


  1. 0

    if i understand the question correctly, you’re trying to remove elements from users1 ( set of LostFollowers ) if they exists in users2.
    I think you can do something like this

    let filteredUser = users1.filter { follower in 
    !users2.contains(follower.user)
}
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  2. 0 
    let filtered = users2.subtracting(users1.map { $0.user })
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