1. 翻转slice

func reverse(s []int) {
    for i,j := 0,len(s)-1; i < j; i,j = i+1,j-1 {
        s[i],s[j] = s[j],s[i]
    }
}

2. []byte间比较大小

package main

import (
    "bytes"
)

func main() {
    // Interpret Compare's result by comparing it to zero.
    var a,b []byte
    if bytes.Compare(a,b) < 0 {
        // a less b
    }
    if bytes.Compare(a,b) <= 0 {
        // a less or equal b
    }
    if bytes.Compare(a,b) > 0 {
        // a greater b
    }
    if bytes.Compare(a,b) >= 0 {
        // a greater or equal b
    }

    // Prefer Equal to Compare for equality comparisons.
    if bytes.Equal(a,b) {
        // a equal b
    }
    if !bytes.Equal(a,b) {
        // a not equal b
    }
}

3. []byte <-> string

// string -> []byte

import "encoding/hex"

address := "Guangzhou"
address_byte := []byte(address)

// []byte -> string
address = hex.EncodeToString(address_byte)