How to Retrieve the Method Set of an Interface in Golang?

How to Retrieve Method Set of an Interface in Golang

Determing the method set of an interface in Golang helps you obtain a list of all the methods a specific interface enforces. To achieve this, we employ the reflect package.

Method Set Extraction Using Reflection

Without prior knowledge of the implementing concrete type, you can use the following code snippet to print the method set:

<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>

Using reflection, we obtain the reflect.Type of the anonymous struct that conforms to the interface. The NumMethod() function retrieves the total number of methods defined by the interface, and the loop iterates through each method, printing its name.

Running the code snippet will produce the following output:

Search
ListSearches
ClearSearches

This method set extraction technique proves useful when you need to work with interfaces dynamically without knowledge of the implementing types.

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