我的Go+语言初体验——语法验证/性能测试篇（直男程序员的真实体验2）

package main
import (
  "fmt"
  "strconv"
  //"github.com/goplus/tutorial/14-Using-goplus-in-Go/foo"
  "math/rand"
  "sort"
  "time"
)
func test1() {
  start := time.Now().UnixMicro()
  num := 10
  for i := 0; i < 1000000; i++ {
    fmt.Sprintf("%d", num)
  }
  end := time.Now().UnixMicro()
  fmt.Printf("格式转换操作 :%d us\n", end-start)
}
func test2() {
  start := time.Now().UnixMicro()
  num := 0
  for i := 0; i < 1000000; i++ {
    num = num + rand.Intn(100)
  }
  fmt.Println(num)
  end := time.Now().UnixMicro()
  fmt.Printf("循环操作 :%d us\n", end-start)
}
func test3() {
  total_arr := []int{}
  for i := 0; i < 1000000; i++ {
    total_arr = append(total_arr, rand.Int())
  }
  start := time.Now().UnixMicro()
  sort.Ints(total_arr)
  end := time.Now().UnixMicro()
  fmt.Printf("排序操作 :%d us\n", end-start)
}
//func test4() {
//  rmap := foo.ReverseMap(map[string]int{"Hi": 1, "Hello": 2})
//  fmt.Println(rmap)
//}
func test5() {
  total_arr := []int{}
  for i := 0; i < 1000000; i++ {
    total_arr = append(total_arr, rand.Intn(100))
  }
  fmt.Println(len(total_arr))
  start := time.Now().UnixMicro()
  result_arr := []int{}
  for _, value := range total_arr {
    result_arr = append(result_arr, value*value)
  }
  end := time.Now().UnixMicro()
  fmt.Printf("列表语法操作 :%d us\n", end-start)
  fmt.Println(len(result_arr))
}
func test6() {
  old_map := map[string]int{}
  for i := 0; i < 1000000; i++ {
    old_map["test"+strconv.Itoa(i)] = i
  }
  start := time.Now().UnixMicro()
  invMap := make(map[int]string, len(old_map))
  for k, v := range old_map {
    invMap[v] = k
  }
  end := time.Now().UnixMicro()
  fmt.Printf("map操作 :%d us\n", end-start)
  fmt.Println(len(invMap))
}
func main() {
  //test1()
  //test2()
  //test3()
  //test4()
  //test5()
  test6()
}