How do I use where clauses for generics and protocols in Swift?

In Swift, you can use where clauses to constrain generic types by specifying conditions that must be satisfied in order for those types to be used. This is particularly useful when working with protocols and allows you to create more flexible and reusable code.

Using where clauses enhances code readability and enforces constraints directly in the type declaration. Here’s an example of how to use where clauses with generics and protocols.

func printElements(_ collection: T) where T.Element: CustomStringConvertible { for element in collection { print(element.description) } } let numbers: [Int] = [1, 2, 3, 4, 5] let strings: [String] = ["Apple", "Banana", "Cherry"] printElements(numbers) // This will not print anything as Int does not conform to CustomStringConvertible. printElements(strings) // This will print each string in the array.

Swift generics protocols where clause Swift programming type constraints

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