Factory: The Function that Isn’t There

Five years of Factory, one operator, and the registration I should have sugared on day one… Factory: The Function that Isn’t There Five years of Factory, one operator, and the registration I should have sugared on day one… Michael Long in The Swift Cooperative   ∙   June 15, 2026   ∙   7 min read   ∙   View on Medium There’s a piece of received wisdom in Swift API design that says callAsFunction is a parlor trick. A novelty. The sort of thing you reach for to win an argument on a forum and then never ship. And to be fair, most of the examples you see make it look that way. A struct Adder you call like adder(2, 3). A wrapper around a closure that already worked fine as a closure. Cute. But pointless. Well, I’ve spent the last five years building a dependency injection library on top of it, and I’m here to tell you it’s the single… Continue reading This is a member-only story and can only be read on Medium. Sent to sikubaycom.s3cr3tz@blogger.com by Michael Long on Medium Unsubscribe from this writer's email notifications Manage your email settings 3500 South DuPont Highway, Suite IQ-101, Dover, DE 19901 Careers·Help Center·Privacy Policy·Terms of service