Packages

A package in Go represents a unit of related code. Other languages often call them libraries.

A package consists of multiple files in a single directory. There's one-to-one mapping between a directory and a package.

You can have multiple packages in a single repository.

Go standard library is provided as a set of packages.

A package is identified by import path e.g. github.com/gomarkdown/markdown is an import path of a package that parses markdown format.

Found a mistake? Have a question or improvement idea? Let me know.

Packages:

* Installing packages locally with go get

* Importing packages

* Creating a package

* Package initialization

* Package naming best practices

Table Of Contents

0 Getting started

1 Basic types

2 Variables

3 Constants

4 Strings

5 Pointers

6 Arrays

7 Slices

8 Maps

9 Structs

10 Interfaces

11 Empty interface

12 if, switch, goto

13 for, while loops

14 range statement

15 Functions

16 Methods

17 Error handling

18 Defer

19 Panic and recover

20 Concurrency

21 Channels and select

22 Mutex

23 Packages

24 Files and I/O

25 Time and date

26 Command line arguments

27 Logging

28 Executing commands

29 Hex, base64 encoding

30 JSON

31 XML

32 CSV

33 YAML

34 SQL

35 HTTP Client

36 HTTP Server

37 Text and HTML templates

38 Reflection

39 Context

40 Package fmt

41 OS Signals

42 Testing

43 Calling C from GO with cgo

44 Profiling using go tool pprof

45 Cross compilation

46 Conditional compilation with build tags

47 Inlining functions

48 sync.Pool for better performance

49 gob

50 Plugin

51 HTTP server middleware

52 Protobuf in Go

53 Console I/O

54 Cryptography

55 Images (PNG, JPEG, BMP, TIFF, WEBP, VP8, GIF)

56 The Go Command

57 Testing code with CI services

58 Windows GUI programming

59 Contributors