基于Go Int轉(zhuǎn)string幾種方式性能測(cè)試

fmt.Sprintf("%d",n)
strconv.Itoa(n)
strconv.FormatInt(n,10)

package gotest
import (
	"fmt"
	"strconv"
	"testing"
)
func BenchmarkSprintf(b *testing.B) {
	n := 10
	b.ResetTimer()
	for i := 0; i  b.N; i++ {
		fmt.Sprintf("%d", n)
	}
}
func BenchmarkItoa(b *testing.B) {
	n := 10
	b.ResetTimer()
	for i := 0; i  b.N; i++ {
		strconv.Itoa(n)
	}
}
func BenchmarkFormatInt(b *testing.B) {
	n := int64(10)
	b.ResetTimer()
	for i := 0; i  b.N; i++ {
		strconv.FormatInt(n, 10)
	}
}

go test -v -bench=. int2string_test.go -benchmem

goos: darwin
goarch: amd64
BenchmarkSprintf-8      20000000               114 ns/op              16 B/op          2 allocs/op
BenchmarkItoa-8         200000000                6.33 ns/op            0 B/op          0 allocs/op
BenchmarkFormatInt-8    300000000                4.10 ns/op            0 B/op          0 allocs/op
PASS
ok      command-line-arguments  5.998s

package main
 
import (
 "fmt"
 "reflect"
 "strconv"
)
 
func main() {
 //字符串轉(zhuǎn)成整型int
 num,err:=strconv.Atoi("123")
 if err!=nil {
  panic(err)
 }
 fmt.Println(num,reflect.TypeOf(num))
 
 //整型轉(zhuǎn)換成字符串
 str:=strconv.Itoa(123)
 fmt.Println(str,reflect.TypeOf(str))
}