How to use BehaviorRelay as an alternate to Variable in RxSwift?

Question

As of RxSwift4, Variable is moved to Deprecated.swift marking the possible deprecation of Variable in future. An alternate proposed to

Answer 1

Building on Dalton's answer, here is a handy extension:

extension BehaviorRelay where Element: RangeReplaceableCollection {
    func acceptAppending(_ element: Element.Element) {
        accept(value + [element])
    }
}