How to List Method Names in a Go Interface Type Using Reflection?

Listing Method Names in an Interface Type Using Runtime Reflection

In Go, interfaces define contracts for method signatures. However, obtaining the names of methods within an interface at runtime can be challenging. This article addresses this issue, exploring a method to list the method names using reflection.

Problem:

Consider the following interface type:

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

The objective is to obtain a list of method names like ["Foo1", "Foo2"] dynamically using runtime reflection.

Solution:

To retrieve the method names, we can use the following steps:

1. Obtain the reflect.Type:
   To access metadata about the interface type, we obtain its reflect.Type using the Elem() method on the reflect.TypeOf() expression of the nil pointer to the interface.
2. Loop through Methods:
   Once we have the reflect.Type, we iterate through its methods using the NumMethod() and Method() functions.
3. Extract Method Names:
   For each method, we retrieve its name using the Name() method and append it to the resulting list.

Here's the code implementation:

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

By utilizing the provided solution, you can dynamically generate a list of method names for any given interface type in your Go programs.

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