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Variadic Functions

Let’s learn about variadic functions.

We'll cover the following...

General ideas and rules
Passing os.Args as ...interface{}
Coding example
Let’s try our code

Variadic functions are functions that can accept a variable number of parameters—we already know about fmt.Println() and append(), which are both variadic functions that are widely used. In fact, most functions found in the fmt package are variadic.

General ideas and rules

The general ideas and rules behind variadic functions are as follows:

Variadic functions use the pack operator, which consists of a ..., followed by a data type. So, for a variadic function to accept a variable number of int values, the pack operator should be ...int.
The pack operator can only be used once in any given function.
The variable that holds the pack operation is a slice and, therefore, is accessed as a slice inside the variadic function.
The variable name that is related to the pack operator is always last in the list of function parameters.
When calling a variadic function, we should put a list of values separated by ...

Course Introduction

Introduction to Go

Basic Go Data Types

Composite Data Types

Reflection and Interfaces

Go Packages and Functions

Telling a UNIX System What to Do

Go Concurrency

Building Web Services

Working with TCP/IP and WebSocket

Working with REST APIs

Code Testing and Profiling

Working with gRPC

Go Generics

Conclusion

Appendix A—Go Garbage Collector

Variadic Functions

General ideas and rules