evolution, with the core team making source stability a focus in later versions.

Swift 4.0, released on September 19, 2017, introduced several changes to some built-in classes and structures. Code written with previous versions of Swift can be updated using the migration functionality built into Xcode. Swift 4.1 was released on March 29, 2018. In the first quarter of 2018, Swift surpassed Objective-C in measured popularity.

Swift 5, released in March 2019, introduced a stable binary interface

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