In Swift, the mutating keyword is used in struct and enum definitions to indicate that a method will modify (or "mutate") the instance it belongs to. Unlike classes, structs and enums are value types, meaning they are copied when assigned to a new variable or passed to a function. By default, methods in structs and enums cannot modify instance properties. This is where mutating comes in, allowing methods in these types to modify their properties.
When to Use mutating in Swift
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