More than one type can implement the same interface. For example if s1 and s2 are two types than they can both implement the same interface (for e.g. file interface).
- func (p T) Read(p []byte) (n int, err error)
- func (p T) Write(p []byte) (n int, err error)
- func (p T) Close() error
where T is either s1 or s2. (regardless of what other methods s1 and s2 contains)
A type implements any interface comprising any subset of its methods and may therefore implement several distinct interfaces. For instance, all types implement the empty interface:
- interface{}
Interface type:
- type Locker interface {
- Lock()
- Unlock()
- }
If S1 and S2 also implement
- func (p T) Lock() { … }
- func (p T) Unlock() { … }
They implement the Locker interface as well as the File interface.

	Created by Alex Danyluik about 4 years ago

In this notebook I try to explain go interfaces. Mainly, what is an interface and how they work in golang.