How to Determine the Method Set of an Interface in Go?

Determining the Method Set of an Interface in Go

When working with interfaces in Go, it can be useful to inspect the set of methods that an interface defines. This information can be invaluable for tasks such as validation, code generation, or simply understanding the intent of an interface.

Obtaining the Method Set Using Reflection

The Go language provides a powerful reflection package that allows you to examine the runtime representation of variables, including types. To retrieve the method set of an interface, we can use the following steps:

1. Get the type information of the interface using reflect.TypeOf().
2. Use the NumMethod() method on the type to get the number of methods defined by the interface.
3. Iterate through the methods using the Method() method on the type, obtaining the method's name.

Here's a code snippet that demonstrates these steps:

<code class="go">package main

import (
    "fmt"
    "reflect"
)

type Searcher interface {
    Search(query string) (found bool, err error)
    ListSearches() []string
    ClearSearches() (err error)
}

func main() {
    t := reflect.TypeOf(struct{ Searcher }{})
    for i := 0; i < t.NumMethod(); i++ {
        fmt.Println(t.Method(i).Name)
    }
}</code>

Running this program will output the names of the methods defined by the Searcher interface:

Search
ListSearches
ClearSearches

This technique allows you to determine the method set of an interface without knowing the concrete type that implements it.

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