MutationOperator.swift

infix operator ~: MultiplicationPrecedence

@discardableResult
func ~<U: AnyObject>(object: U, block: (U) -> Void) -> U {
    block(object)
    return object
}

let titleLabel = UILabel() ~ {
    $0.font = .systemFont(ofSize: 22)
    $0.textColor = .red
    $0.text = "WELCOME"
}