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The Swift programming language is a language that Apple developed for various operating systems, including some of its smartphone operating systems, as well as desktop platforms.
It's a take on Objective-C that similarly utilizes variables to store values.
As a type-safe language, Swift ensures that programmers do not pass a variable with the wrong data type. Experts maintain that Swift has some good tools for creating mobile apps for the iPhone with its own studio and tools including unit testing capabilities and repositories for core data.
These and other features make Swift a popular part of an app dev stack for Apple-oriented projects.