Functions

Function Literal in Go

A function literal is a function declared inline without a name.

In all other languages, this is called an anonymous function.

Syntax

func(paramName dataType) (returnVarName returnType) {
    //code to execute
    returnVarName = value
    return value //if no return variable name specified but returnType specified
    return //if return variables are assigned in the function
}

Notes

Most often used in return statements within closures.

Example

package main

import "fmt"

func square(x int) func() int {
    return func() int { //anonymous function
        x = x * x
        return x
    }
}

func main() {
    twoSquared := square(2)
    fmt.Println("2 squared is: ", twoSquared)
}

See Also

Closures

The Go Programming Language Specification - The Go Programming Language