How can I programmatically retrieve method names from an interface type using reflection in Go?

Getting Method Names from Interface Types

Obtaining a list of method names for an interface type through runtime reflection is a common task. For instance, in an interface type like:

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

You might want to dynamically retrieve the method names ["Foo1", "Foo2"] using reflection.

Solution:

To achieve this, utilize the following code snippet:

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

Explanation:

1. Retrieve the Interface Type: To start, acquire the reflect.Type of the interface type. This is accomplished by first obtaining the reflect.Type of a nil pointer to the interface type using reflect.TypeOf((*FooService)(nil)). Then, utilize the Elem() method to derive the underlying type, which is the interface type itself.
2. Iterate Over Methods: Next, iterate through the interface type's methods using a loop. The NumMethod() method provides the count of methods, and Method(i) retrieves the i-th method.
3. Extract Method Names: For each method, extract its name using the Name field of the reflect.Method type. The resulting list of method names is stored in the s slice.

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