The range keyword is mainly used for loops to iterate over all the elements of a map, slice, channel, or array.

package main
import "fmt"

var Prwa = []int{1, 3, 9, 27, 81, 243, 729, 2187}

func main() {
    for i, x := range Prwa {
        fmt.Printf("3**%d=%d\n", i, x)
    }
}

Output :

PS C:\GO_Language\range> go run range.go
3**0=1
3**1=3
3**2=9
3**3=27
3**4=81
3**5=243
3**6=729
3**7=2187

1. Initializing slices using Range.

   package main
   
   import "fmt"
   
   func main() {
       pow := make([]int, 10)
       for i:= range pow {
           pow[i] = i 
   Output :
   PS C:\GO_Language\range> go run range2.go
   0
   2
   8
   24
   64
   160
   384
   896
   2048
   4608
   

• Simple Map program

  package main
  
  import "fmt"
  
  func main() {
      var map_1 map[int]int
      if map_1 == nil {
          fmt.Println("True")
      } else {
          fmt.Println("False")
      }
  
      map_2 := map[int]string{
          90: "Red",
          91: "Yellow",
          92: "Orange",
          93: "Green",
          94: "Pink",
          95: "Blue",
          96: " ",
      }
  
      fmt.Println("Map_2", map_2)
  }
  

  Output :

  PS C:\GO_Language\range> go run range3.go
  True
  Map_2 map[90:Red 91:Yellow 92:Orange 93:Green 94:Pink 95:Blue 96: ]
  

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