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Advanced Techniques in Go Programming

Variadic Functions

Explore how to implement and utilize variadic functions in Go, enabling you to write flexible functions that accept a variable number of arguments. Understand the use of the pack operator, how to handle slices and interface conversions, and see example code demonstrating these concepts in practice.

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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 ...