Invoke didSet when property’s value is set inside init context

Property observers are only called when the property’s value is set outside of initialization context.

defer can change situation 😊

class Member {
    var ageMember: Int! {
        didSet {
            print("Function: \(#function)")
        }
    }

    init(age: Int) {
        self.ageMember = age
    }
}

class User {
    var ageUser: Int! {
        didSet {
            print("Function: \(#function)")
        }
    }

    init(age: Int) {
        defer {
            self.ageUser = age
        }
    }
}

Function: ageUser

Group objects by property

One more useful extension Gives you opportunity to group objects by property 👨‍

extension Sequence {
    func group<GroupingType: Hashable>(by key: (Iterator.Element) -> GroupingType) -> [[Iterator.Element]] {
        var groups: [GroupingType: [Iterator.Element]] = [:]
        var groupsOrder: [GroupingType] = []
        forEach { element in
            let key = key(element)
            if case nil = groups[key]?.append(element) {
                groups[key] = [element …

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