Functions

Function Signatures

Go functions are declared with func, followed by name, parameters (name type), and return types. Parameters of same type can share type declaration.

Multiple Return Values

Go's multiple returns are idiomatic for returning value + error, or multiple computed values. No tuple allocation overhead.

Variadic Functions

Variadic functions accept variable number of arguments. Inside, the parameter is a slice. Call with multiple args or a slice with ....

Closures

A closure is a function that captures variables from its surrounding scope. The captured variables are shared between the closure and the outer scope.

First-Class Functions

Functions are values — assign to variables, pass as arguments, return from functions. Enables higher-order functions and functional patterns.