How to create a Swift filter query based on multiple conditions?

Question

I am currently recording the discovery preference of a User (see image below) and would like to filter the list of Users being displayed in a CollectionView that meet the discovery preferences set by the User.

Every User in the array has a birthYear, gender and discoverable Bool.

This is my function which currently works for only the discoverable Bool and displays only User's which are set to true.

How do I chain the filter conditions that I need in order to only display those Users that meet the discovery preferences of a User above?

    func discoverUsers(location: CLLocation) {

        DataService.run.getUsersAtVenue(forVenueLocation: location, forUid: (Auth.auth().currentUser?.uid)!) { (users, success) in

            if success {
                self.users = users

                self.filteredUsers = self.users.filter({ (user: User) -> Bool in
                    return user.discoverable == true

                    //-> Chain filter conditions to check for here: gender, age
                })

                self.collectionView.reloadData()
                Utilities.run.dismissSVHUD(delay: 0.5)

            }//end if

        }//end closure

    }//end func


}//end class

Stormsyders · Accepted Answer · 2018-06-18 06:09:56Z

2

I am having a hard time understanding precisely what you want to achieve in particular. However, here is how the filter function plays out:

Given that users is an array of elements of type:

struct User {
    let age: Int
    let isMale: Bool
    // ...
}

You can filter like so:

filteredUsers = users.filter { user in
     return (user.age <= maxAge && user.age >= minAge) && /* include any other condition you need */ 
}

answered Jun 18, 2018 at 6:09

Stormsyders

2852 silver badges11 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Roggie Over a year ago

yeah this actually helped...I'm still a beginner and didn't realise that you can simply bind the filter condition one after another in the way you have shown.

Stormsyders Over a year ago

Alright I am really glad it helped! Try to do more research by your own as you gain expertise as a "How to use the filter function in swift" Google search or a quick look at apple's book on swift would be enough to answer your question for example

Collectives™ on Stack Overflow

How to create a Swift filter query based on multiple conditions?

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related