The Swift Standard Library preview package provides access to functionality that has been accepted into the Swift standard library through the Swift Evolution process, but has not yet shipped as part of an official Swift release.
If like most of us, you aren’t tuned into the comings-and-goings of Swift Evolution, Xcode 11.4 is your first exposure to two new additions to the language: key path expressions as functions and callable values of user-defined nominal types.
The phrase “Swifty code” is often used to describe code that follows the conventions that are currently the most popular within the Swift community. But what exactly does that entail? Let’s take a look.