mutating
Asked on 10/10/2024
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Mutating a value in Swift involves temporarily taking ownership of the current value stored in a mutable variable. This is different from consuming a value, where the variable no longer expects to have ownership of the value afterwards. When you call a mutating method, ownership of the value is transferred to the method, and Swift ensures that the variable cannot be used in any other way during the call. Once the method completes, ownership of the new value is transferred back to the variable, maintaining the invariant that the variable has ownership of its value.
For more details, you can refer to the session Explore Swift performance (16:19).
A Swift Tour: Explore Swift’s features and design
Learn the essential features and design philosophy of the Swift programming language. We’ll explore how to model data, handle errors, use protocols, write concurrent code, and more while building up a Swift package that has a library, an HTTP server, and a command line client. Whether you’re just beginning your Swift journey or have been with us from the start, this talk will help you get the most out of the language.
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Explore Swift performance
Discover how Swift balances abstraction and performance. Learn what elements of performance to consider and how the Swift optimizer affects them. Explore the different features of Swift and how they’re implemented to further understand the tradeoffs available that can impact performance.