Basic function usage:

https://codeeval.dev/gist/0309cb6b537361d2aaf4eed3220e2825

Parameters

A function can optionally declare a set of parameters:

https://codeeval.dev/gist/26a4febfe8f8d87c01cd1c7bc9e86836

Type for firstName is omitted because it is identical to lastName.

Return values

A function can return one or more values to the caller:

https://codeeval.dev/gist/dd5d25485e5cccff6d1c8c10145a283c

Named return values

You can name returned values in which case they act as implicit local variable.

An empty return statement can then be used to return their current values. This is known as “naked” return.

https://codeeval.dev/gist/70d1523c8b4c5bc79efc68e9f98b22c3

Two important things must be noted:

• parenthesis around the return values are mandatory
• empty return statement must always be provided

Using named return values is considered a bad practice that hinders readability, especially in longer function. Explicit is better than implicit.

Variadic functions

A variadic function can be called with any number of trailing arguments. Those elements are stored in a slice.

https://codeeval.dev/gist/485ce74c6a9b15b66e41283147febaa4