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API reference

Go API reference

The language, standard library and concurrency

Last updated 1 November 2026

Identifiers: 80
With full guides: 0
Types: 5

Topics covered

Basics
Concurrency
Errors
Standard library
Testing
Tooling

Class

Name	What it does
`sync.Mutex`	Class
`sync.RWMutex`	Class
`sync.WaitGroup`	Class
`sync.Once`	Class
`sync.Map`	Class
`http.Client`	Class
`http.Server`	Class
`http.Request`	Class
`bufio.Scanner`	Class
`bytes.Buffer`	Class
`time.Duration`	Class

Function

Name	What it does
`fmt.Println`	Function
`fmt.Printf`	Function
`fmt.Sprintf`	Function
`fmt.Errorf`	Function
`errors.New`	Function
`errors.Is`	Function
`errors.As`	Function
`strings.Split`	Function
`strings.Join`	Function
`strings.Contains`	Function
`strconv.Itoa`	Function
`strconv.Atoi`	Function
`json.Marshal`	Function
`json.Unmarshal`	Function
`http.Get`	Function
`http.ListenAndServe`	Function
`http.HandleFunc`	Function
`context.Background`	Function
`context.WithCancel`	Function
`context.WithTimeout`	Function
`time.Now`	Function
`time.Sleep`	Function
`os.Open`	Function
`os.ReadFile`	Function
`os.Getenv`	Function
`io.ReadAll`	Function
`sort.Slice`	Function
`slices.Sort`	Function
`maps.Keys`	Function
`make`	Function
`new`	Function
`append`	Function
`len`	Function
`cap`	Function
`copy`	Function
`delete`	Function
`panic`	Function
`recover`	Function
`close`	Function

Interface

Name	What it does
`error`	Interface
`io.Reader`	Interface
`io.Writer`	Interface
`http.Handler`	Interface
`context.Context`	Interface
`sort.Interface`	Interface
`fmt.Stringer`	Interface

Command

Name	What it does
`go build`	Command
`go run`	Command
`go test`	Command
`go mod init`	Command
`go mod tidy`	Command
`go get`	Command
`go fmt`	Command
`go vet`	Command
`go generate`	Command
`go install`	Command

Concept

Name	What it does
`Goroutines`	Concept
`Channels`	Concept
`select`	Concept
`defer`	Concept
`Pointers`	Concept
`Structs`	Concept
`Interface embedding`	Concept
`Generics`	Concept
`Method receivers`	Concept
`Slices`	Concept
`Maps`	Concept
`Worker pools`	Concept
`Table-driven tests`	Concept

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