Package “main” and func “main”

by

The entry point for the application is the main function in the main package as described in the specification:

A complete program is created by linking a single, unimported package called the main package with all the packages it imports, transitively. The main package must have package name main and declare a function main that takes no arguments and returns no value.

func main() { … }

Program execution begins by initializing the main package and then invoking the function main. When that function invocation returns, the program exits. It does not wait for other (non-main) goroutines to complete.

The language specification does not give special meaning to the name main outside of this context. The name main is not a reserved name.

It’s OK to declare a main function in non-main packages. In such cases, it’s just a function named main.

Related Contents:

  1. Function declaration syntax: things in parenthesis before function name
  2. When is the init() function run?
  3. How to multiply duration by integer?
  4. Difference between := and = operators in Go
  5. Contains method for a slice
  6. What is a rune?
  7. How to run test cases in a specified file?
  8. How does Go update third-party packages?
  9. How to import local packages without gopath
  10. How to join a slice of strings into a single string?
  11. How to trim leading and trailing white spaces of a string?
  12. How to call function from another file in Go
  13. Go naming conventions for const
  14. Using forked package import in Go
  15. Catching return values from goroutines
  16. How to get all dependency files for a program
  17. Read text file into string array (and write)
  18. Redirect stdout pipe of child process in Go
  19. Access a map value using a variable key in a Go template
  20. Max number of goroutines
  21. Basic HTTP Auth in Go
  22. How to set GOPRIVATE environment variable
  23. How to embed files into Go binaries
  24. Go string to ascii byte array
  25. Convert an integer to a byte array
  26. How to make a channel that receive multiple return values from a goroutine
  27. In a template how do you access an outer scope while inside of a “with” or “range” scope?
  28. Is there a difference between new() and “regular” allocation?
  29. Explain: Don’t communicate by sharing memory; share memory by communicating
  30. Strip all whitespace from a string
  31. Golang. What to use? http.ServeFile(..) or http.FileServer(..)?
  32. How to check if a string only contains alphabetic characters in Go?
  33. What does an empty select do?
  34. File name convention for compound words?
  35. How to cross compile from Windows to Linux?
  36. Go: Meaning of the ‘fmt’ package acronym
  37. Where is the module cache in golang?
  38. What is the Big O performance of maps in golang?
  39. Are Golang binaries portable?
  40. Golang struct initialization
  41. Call a Struct and its Method by name in Go?
  42. Go template name
  43. Does fmt.Print() write to stdout in GoLang?
  44. Pass method argument to function
  45. go test flag: flag provided but not defined
  46. Convert interface to struct
  47. Return an unexported type from a function
  48. Golang Gorilla mux with http.FileServer returning 404
  49. What can you do in 30 lines of Go? Can you create a useful, complete program that demonstrates its features? [closed]
  50. Which types are mutable and immutable in the Google Go Language?

Leave a Comment