Web Reference: Jul 2, 2018 · Since Swift structs are immutable objects, calling a mutating function actually returns a new struct in-place (much like passing an inout parameter to a function). The mutating keyword lets callers know that the method is going to make the value change. May 22, 2025 · When you mark a method as mutating, you’re allowing that method to modify the properties of the struct or even assign a new value to self. This is a key part of Swift’s philosophy. Jul 7, 2021 · Essentially, a function that’s been marked as mutating can change any property within its enclosing value. The word “value” is really key here, since Swift’s concept of structured mutations only applies to value types, not to reference types like classes and actors.
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