golang字符串

• 字符串长度

  str := "acbd"
  len := len(str)
  

• 第几个字符

  str := "abcd"
  first := str[0] 
  

• 子串

  str := "abcd"
  sub := str[1:3]
  

• 遍历

   str := "abcd"
  
  for index, char := range str {
      fmt.Printf("%d %c\n",index,char)
  }
  

• 连接
  1.快

      var buf bytes.Buffer
      buf.WriteString("hello ")
      buf.WriteString("world")
      fmt.Println(buf.String()) //hello world
  

  2.方便

  str := "hello"
  str += "world"