How Can I Call Go Struct Methods by Name Using Reflection?

Calling Go Structs and Their Methods by Name

When dealing with reflection in Go, one may encounter the need to call a method of a struct by its name. The MethodByName() function within the reflect package comes to mind, but its usage may not be immediately apparent. This article aims to provide a simplified approach to calling structs and their methods by name.

MethodByName() and StructByName()

The misconception that StructByName() is required before calling MethodByName() is incorrect. MethodByName() can be utilized directly to retrieve the desired method.

Calling a Struct Method by Name

Here's an example illustrating how to call a struct method by name:

type MyStruct struct {
    //some feilds here
}

func (p *MyStruct) MyMethod() {
    println("My statement.")
}

// Notice there is no StructByName() function call here
CallFunc("MyStruct", "MyMethod") // prints "My statement."

In this example, the method MyMethod is called on an instance of *MyStruct, which was previously defined.

Reflection-Based Approach

Here's a reflection-based approach to calling struct methods by name:

package main

import "fmt"
import "reflect"

type T struct {
}

func (t *T) Foo() {
    fmt.Println("foo")
}

func main() {
    t := &T{}
    reflect.ValueOf(t).MethodByName("Foo").Call([]reflect.Value{})
}

This approach leverages reflect.ValueOf to obtain a Value object, which represents the instance of struct. MethodByName() is then used to retrieve the desired method, which is subsequently called using Call().

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