ios8 - filteredArrayUsingPredicate does not exist in swift Array

Question

I have "UserDetails" struct objects in array..I want to filter the objects from array. But there is no option for "filteredArrayUsingPredicate" in Swift array.

My array creation

var arrayOfUsers:UserDetails[] = UserDetails[]()

my userdetails code is

struct UserDetails{
    var userName:String
    var userID:String
    var userAge:String
    func userDescription()->String{
        return "name " + userName + "age " + userID
    }
}

my code to create objects

        for a in 1...1000{
            var user:UserDetails = UserDetails(userName: "name", userID: String(a), userAge: "22")
            arrayOfUsers.append(user)
        }

Now I want to filter arrayOfUsers which one has userID "1".

Answer 1

Swift arrays have a .filter method that takes a closure -- this will do it:

let filteredArray = arrayOfUsers.filter() { $0.userID == "1" }

Closures can be simplified in a variety of ways. The full declaration of the closure would look more like this:

var filteredArray = arrayOfUsers.filter( { (user: UserDetails) -> Bool in
        return user.userID == "1"
    })

The difference between the two is that the first is using trailing closure syntax, shorthand argument names, type inference, and implicit return. You can read more about closures in Apple's Swift documentation.