You declare a type constraint as an interface. The constraint allows any
type implementing the interface. For example, if you declare a type constraint
interface with three methods, then use it with a type parameter in a generic
function, type arguments used to call the function must have all of those
methods.
Constraint interfaces can also refer to specific types
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Tutorial: Getting started with generics - The Go Programming Languageraint you defined earlier into its own interface so that you can reuse it in multiple places. Declaring constraints in this way helps streamline code, such as when a constraint is more complex. <span>You declare a type constraint as an interface. The constraint allows any type implementing the interface. For example, if you declare a type constraint interface with three methods, then use it with a type parameter in a generic function, type arguments used to call the function must have all of those methods. Constraint interfaces can also refer to specific types, as you’ll see in this section. Write the code Just above main, immediately after the import statements, paste the following code to declare a type constraint. type Number interface { i Summary
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