How to Retrieve Method Names from an Interface Type using Reflection in Go?

Obtaining Method Names from an Interface Type

In the world of programming, reflection allows access to information about types and objects at runtime. One common scenario is retrieving method names from an interface type. Suppose you have the following interface definition:

<code class="go">type FooService interface {
    Foo1(x int) int
    Foo2(x string) string
}</code>

The goal is to use reflection to generate a list of method names, in this case, ["Foo1", "Foo2"].

Solution:

To achieve this, the following steps are involved:

1. Obtain the reflect.Type of the interface type:

   <code class="go">type FooService interface {...}
   t := reflect.TypeOf((*FooService)(nil)).Elem()</code>

   This line retrieves the reflection type of the interface FooService, which is the underlying concrete type.

2. Iterate through the methods of the type:

   <code class="go">for i := 0; i < t.NumMethod(); i++ {</code>

   The NumMethod method returns the number of methods, allowing you to loop through each one.

3. Retrieve the name of each method:

   <code class="go">name := t.Method(i).Name</code>

4. Append the method name to a slice:

   <code class="go">s = append(s, name)</code>

   This accumulates the method names into a slice.

Putting it all together:

<code class="go">type FooService interface {
    Foo1(x int) int
    Foo2(x string) string
}

func main() {
    t := reflect.TypeOf((*FooService)(nil)).Elem()
    var s []string
    for i := 0; i < t.NumMethod(); i++ {
        name := t.Method(i).Name
        s = append(s, name)
    }
    fmt.Println(s) // Output: [Foo1 Foo2]
}</code>

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