How Can I Determine Method Existence in Go?

Querying Method Existence in Go

In Go, unlike Objective-C, there is no explicit mechanism to check if an object has a particular method. However, there are several approaches to address this need.

Simple Method Check

You can define an interface with only the method you're interested in and perform a type assertion against your object:

i, ok := myInstance.(InterfaceImplementingThatOneMethodIcareAbout)

Alternatively:

i, ok = myInstance.(interface{ F() })

A true value for ok indicates that the method exists.

Advanced Approach: Reflect Package

The reflect package provides a more comprehensive way to introspect types:

st := reflect.TypeOf(myInstance)
m, ok := st.MethodByName("F")

If ok is false, the method doesn't exist. Otherwise, you can invoke the method using m.F().

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