Empty Interface

Sometimes we have no idea about the types that can be used by the code. Therefore, Go provides us with ‘empty interfaces’ that let us deal with these values. This lesson shows us how to work with them.

We'll cover the following

- Introduction
- Interface to interface
- Type map[string] interface{}

Introduction

The empty or minimal interface has no methods, and so it doesn’t make any demands at all.

type Any interface{}

Any variable, any type implements it (not only reference types that inherit from Object in Java/C#), and any or Any is a good name as an alias and abbreviation! (It is analogous to the class Object in Java and C#, the base class of all classes. So, Obj would also fit.) A variable of that interface type var val interface{} can through assignment receive a variable of any type.

This is illustrated in the program:

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Origin, Context and Popularity of GO

Basic Constructs and Elementary Data Types

Control Structures

Functions

Arrays and Slices

Maps

Packages

Structs and Methods

Interfaces and Reflection

Reading and Writing

Error-Handling and Testing

Goroutines and Channels

Networking, Templating and Web-Applications

Common Go Pitfalls and Patterns

Performance Advices

Building a Complete Application

Appendix

Empty Interface

Introduction