Join integer array elements with a string e.g. [1,2,3,4] => "1, 2, 3, 4"

join.go

package main

import (
  "fmt"
  "strconv"
  )

  func Join(arr []int64, str string) string {
    result := ""
    last_index := len(arr) - 1
    for i, v := range arr {
      result = result + strconv.FormatInt(v, 10)
      if i != last_index {
        result = result + str
      }
    }
    return result
  }

  func main() {
    array := []int64{1,2,3,4}
    fmt.Println(Join(array, ","))
  }