fmt.Sprintf strconv.Itoa 效率实验

 1 package main
 2
 3 import (
 4     "fmt"
 5     "strconv"
 6     "time"
 7 )
 8
 9 const LOOP = 100000
10
11 var num int64 = 10
12
13 func main() {
14     startTime := time.Now()
15     for i := 0; i < LOOP; i++ {
16         fmt.Sprintf("%d", i)
17     }
18     fmt.Printf("fmt.Sprintf taken: %v\n", time.Since(startTime))
19
20     startTime = time.Now()
21     for i := 0; i < LOOP; i++ {
22         strconv.Itoa(i)
23     }
24     fmt.Printf("strconv.FormatInt taken: %v\n", time.Since(startTime))
25 }

得到的结果为

fmt.Sprintf taken: 23.0013ms

strconv.FormatInt taken: 4.0002ms

参考：http://deanthompson.github.io/tag/golang.html