Sumit Agrawal gophersumit

Go (Golang) Standard Library Interfaces (Selected)

This is not an exhaustive list of all interfaces in Go's standard library. I only list those I think are important. Interfaces defined in frequently used packages (like io, fmt) are included. Interfaces that have significant importance are also included.

All of the following information is based on go version go1.8.3 darwin/amd64.

	// source : https://golang.org/src/net/http/response.go?s=731:4298#L25
	type Response struct {
	Status string // e.g. "200 OK"
	StatusCode int // e.g. 200
	Proto string // e.g. "HTTP/1.0"
	ProtoMajor int // e.g. 1
	ProtoMinor int // e.g. 0
	Header Header
	Body io.ReadCloser
	ContentLength int64

	// source : https://golang.org/src/net/http/request.go?s=3252:11812#L97
	type Request struct {
	Method string
	URL *url.URL
	Proto string // "HTTP/1.0"
	ProtoMajor int // 1
	ProtoMinor int // 0
	Header Header
	Body io.ReadCloser
	GetBody func() (io.ReadCloser, error)

	// from https://golang.org/src/net/http/server.go?s=77156:81268#L2480
	// A Server defines parameters for running an HTTP server.

	// The zero value for Server is a valid configuration.
	type Server struct {
	Addr string // TCP address to listen on, ":http" if empty
	Handler Handler // handler to invoke, http.DefaultServeMux if nil
	TLSConfig *tls.Config
	ReadTimeout time.Duration
	ReadHeaderTimeout time.Duration

	package main

	import (
	"log"
	"os"
	)

	func main() {
	file, err := os.Open("file.go")
	//handle errors first if any

	package main

	import (
	"log"
	"os"
	)

	func main() {
	file, err := os.Open("file.go") // For read access.
	if err != nil {


	switch expression
	{
	case expression_value1:
	Statement
	case expression_value2:
	Statement
	case expression_value3:
	Statement
	fallthrough // cam use fallthrough to explicitly define fallthrough behavior

	switch (expression)
	{
	case expression_value1:
	Statement
	break; // required to stop next case from executing
	case expression_value2:
	Statement
	break; // required to stop next case from executing
	case expression_value3:
	Statement

	package main

	import "fmt"

	func main() {
	isTrue := true

	if isTrue // if statement must have braces even if statement is single line
	fmt.Println("This is invalid")

	package main
	import "fmt"

	func main() {
	x := 0
	x++ //valid operation

	fmt.Println(x++) // invalid operation x++ is not an expression

	++x // invalid operation , prefix increment does not exist in go