instruction: Explain go by example: functions
output: Go by Example
  : Functions
  Functions
  are central in Go. We’ll learn about
  functions with a few different examples.
  package
  main
  import
  "fmt"
  Here’s a function that takes two
  int
  s and returns
  their sum as an
  int
  .
  func
  plus
  (
  a
  int
  ,
  b
  int
  )
  int
  {
  Go requires explicit returns, i.e. it won’t
  automatically return the value of the last
  expression.
  return
  a
  +
  b
  }
  When you have multiple consecutive parameters of
  the same type, you may omit the type name for the
  like-typed parameters up to the final parameter that
  declares the type.
  func
  plusPlus
  (
  a
  ,
  b
  ,
  c
  int
  )
  int
  {
  return
  a
  +
  b
  +
  c
  }
  func
  main
  ()
  {
  Call a function just as you’d expect, with
  name(args)
  .
  res
  :=
  plus
  (
  1
  ,
  2
  )
  fmt
  .
  Println
  (
  "1+2 ="
  ,
  res
  )
  res
  =
  plusPlus
  (
  1
  ,
  2
  ,
  3
  )
  fmt
  .
  Println
  (
  "1+2+3 ="
  ,
  res
  )
  }
  $
  go run functions.go
  1+2 = 3
  1+2+3 = 6
  There are several other features to Go functions. One is
  multiple return values, which we’ll look at next.
  Next example:
  Multiple Return Values
  .
  by
  Mark McGranaghan
  and
  Eli Bendersky
  |
  source
  |
  license