How do you programmatically list the method names defined in a Go interface?

Listing Method Names in an Interface Type

In Go, interfaces define a contract of methods that a type must implement. When interacting with interfaces at runtime, you may need to access the names of their methods.

Problem:

Consider the following interface definition:

type FooService interface {
    Foo1(x int) int
    Foo2(x string) string
}

How can you programmatically generate a list of the method names, i.e., ["Foo1", "Foo2"], from the FooService interface?

Answer:

To retrieve the list of method names from an interface type, you can use runtime reflection:

<code class="go">t := reflect.TypeOf((*FooService)(nil)).Elem()
var s []string
for i := 0; i < t.NumMethod(); i++ {
    s = append(s, t.Method(i).Name)
}</code>

Explanation:

1. reflect.TypeOf((*FooService)(nil)).Elem() retrieves the reflect.Type of the interface.
2. t.NumMethod() returns the number of methods in the interface.
3. t.Method(i) retrieves the i-th method of the interface.
4. t.Method(i).Name returns the name of the method.

Playground Example:

https://go.dev/play/p/6cXnZKiKVw1

Tip:

Refer to the documentation on "How to get the reflect.Type of an interface?" for insights on obtaining the reflect.Type of an interface.

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