Generic Constraints and where Clauses
Applying multiple constraints, same-type requirements and conditional extensions.
Generic Basics Recap
Generics let you write flexible, reusable code that works with any type.
func identity<T>(_ value: T) -> T { return value }
print(identity(42))
print(identity("hello"))Single Type Constraint
Constrain a generic parameter to conform to a protocol using T: Protocol.
func largest<T: Comparable>(_ a: T, _ b: T) -> T {
return a > b ? a : b
}
print(largest(3, 7))All lessons in this course
- Generic Constraints and where Clauses
- Opaque Types with some Keyword
- Existentials with any and Type Erasure
- Primary Associated Types and Typed Throws