Golang 数值型字符串比较大小

代码：

package main
 
import (
	"fmt"
)
 
func main()  {
	var str1 = "2"
	var str2 = "11"
	fmt.Println(str1 < str2)
	str1 = "02"
	str2 = "11"
	fmt.Println(str1 < str2)
}

结果：

false
true

总结：

从左到右逐个字符根据ASCII码值的大小来比较。如果要用到字符串比较大小，必须保证位数相同，进制相同。

运行效率比较：

package main
 
import (
	"fmt"
	"strconv"
	"time"
)
 
func main()  {
	timeNow := time.Now().UnixNano()
	fmt.Println(timeNow)
	var str1 = "20191220"
	var str2 = "20191202"
	var result bool
	for i := 0; i < 100000; i++ {
		result = str1 < str2
	}
	timeEnd := time.Now().UnixNano()
	fmt.Println(timeEnd)
	fmt.Println(result, timeEnd-timeNow)
 
 
	timeNow = time.Now().UnixNano()
	fmt.Println(timeNow)
	str1 = "20191220"
	str2 = "20191202"
	for i := 0; i < 100000; i++ {
		num1, _ := strconv.Atoi(str1)
		num2, _ := strconv.Atoi(str2)
		result = num1 < num2
	}
	timeEnd = time.Now().UnixNano()
	fmt.Println(timeEnd)
	fmt.Println(result, timeEnd-timeNow)
}