Golang-libs

02 03, 1402 1 min 15 s

fmt

fmt.Println(i)

fmt.Sprintf("%v", v)
fmt.Sprintf("%d", ip[0])

str := fmt.Sprint( int( ip[i] ) )

fmt.Fprintf(conn, text)

var input string
fmt.Scanln(&input) //read

Printf

فایل pdf

Printf Format

  var (
    planet   = "venus"
    distance = 261
    orbital  = 224.701
    hasLife  = false
  )

  // swiss army knife %v verb
  fmt.Printf("Planet: %v\n", planet)
  fmt.Printf("Distance: %v millions kms\n", distance)
  fmt.Printf("Orbital Period: %v days\n", orbital)
  fmt.Printf("Does %v have life? %v\n", planet, hasLife)

  fmt.Printf("Orbital Period: %f days\n", orbital)
  fmt.Printf("Orbital Period: %.0f days\n", orbital)
  fmt.Printf("Orbital Period: %.1f days\n", orbital)
  fmt.Printf("Orbital Period: %.2f days\n", orbital)

  // Planet: venus
  // Distance: 261 millions kms
  // Orbital Period: 224.701 days
  // Does venus have life? false
  
  // Orbital Period: 224.701000 days
  // Orbital Period: 225 days
  // Orbital Period: 224.7 days
  // Orbital Period: 224.70 days

bytes

var buffer bytes.Buffer
buffer.WriteString( fmt.Sprintf("%v", v) )
return buffer.String()

strconv

strconv.Itoa( int(b) ) //if b str or byte
strconv.Itoa(     b  ) 
strconv.Itoa(rr.t) // convert int to strint

strings

strings.Join( arr , ".")
strings.TrimSpace(name)

time

time.Now() // 2009-11-10 23:00:00 +0000 UTC m=+0.000000001
time.Sleep(time.Second) //Sleep one second

os

f, err := os.Create("words.txt")
f, err := os.Open("sid.jpg")

log

log.Fatal(err)

bufio

In Golang, bufio is a package used for buffered IO. Buffering IO is a technique used to temporarily accumulate the results for an IO operation before transmitting it forward. This technique can increase the speed of a program by reducing the number of system calls, which are typically slow operations. In this shot, we will look at some of the abstractions bufio provides for writing and reading operations.

reader := bufio.NewReader(os.Stdin)
text, _ := reader.ReadString('\n')

ioutil

caCert, err := ioutil.ReadFile("GeoTrust_Global_CA.pem")
body, err := ioutil.ReadAll(resp.Body)

sync

//mutex
m := new(sync.Mutex)
m.Lock()
  //Write code here
m.Unlock()
///end mutex