Go语言中的byte和rune区别对比

Posted 2022-09-25

Go语言中byte和rune实质上就是uint8和int32类型。byte用来强调数据是raw data，而不是数字；而rune用来表示Unicode的code point。参考规范：

uint8       the set of all unsigned  8-bit integers (0 to 255)
int32       the set of all signed 32-bit integers (-2147483648 to 2147483647)

byte        alias for uint8
rune        alias for int32

可以通过下面程序验证：

package main

import "fmt"

func byteSlice(b []byte) []byte 
    return b


func runeSlice(r []rune) []rune 
    return r


func main() 
    b := []byte0, 1
    u8 := []uint82, 3
    fmt.Printf("%T %T \\n", b, u8)
    fmt.Println(byteSlice(b))
    fmt.Println(byteSlice(u8))

    r := []rune4, 5
    i32 := []int326, 7
    fmt.Printf("%T %T \\n", r, i32)
    fmt.Println(runeSlice(r))
    fmt.Println(runeSlice(i32))

执行结果如下：

[]uint8 []uint8
[0 1]
[2 3]
[]int32 []int32
[4 5]
[6 7]

package main

import (
    "fmt"
)

func main() 
    var indexRuneTests = []struct 
        s    string
        rune rune
        out  int
    
        //string用反引号能换行, 但不支持转义， rune是一个uint32，即一个unicode字符
        `as\\n
        df`, A, 2,
        //用双引号不能换行, 但支持转义如"\\n\\t.."，  rune是一个uint32，即一个unicode字符
        "some_text\\n=some_value", =, 9,
        "☺a", ☺, 3,
        "a☻☺b", ☺, 4,
    

    fmt.Println("Hello, playground",indexRuneTests)

Hello, playground [as\\n
        df 65 2 some_text
=some_value 61 9 ☺a 9786 3 a☻☺b 9786 4]

 

参考资料：
​​​Difference between []uint8 && []byte (Golang Slices)​​。

 

​

作者：sunsky303