// Measuring function execution time in
// Go using a reusable Timer (milliseconds + seconds)
package main
import (
"fmt"
"time"
)
// ---------------------------
// Reusable Timer struct
// ---------------------------
type Timer struct {
start time.Time
end time.Time
}
// Start the timer
func (t *Timer) Start() {
t.start = time.Now()
}
// Stop the timer
func (t *Timer) Stop() {
t.end = time.Now()
}
// Return elapsed time in milliseconds
func (t *Timer) ElapsedMilliseconds() float64 {
return float64(t.end.Sub(t.start).Milliseconds())
}
// Return elapsed time in seconds
func (t *Timer) ElapsedSeconds() float64 {
return t.end.Sub(t.start).Seconds()
}
// ---------------------------
// Function to measure
// ---------------------------
func work() {
sum := 0
for i := 0; i < 100000000; i++ {
sum += i
}
}
// ---------------------------
// Main program
// ---------------------------
func main() {
var t Timer
t.Start()
work()
t.Stop()
ms := t.ElapsedMilliseconds()
sec := t.ElapsedSeconds()
fmt.Println("Execution time:", ms, "ms")
fmt.Println("Execution time:", sec, "seconds")
}
/*
run:
Execution time: 33 ms
Execution time: 0.033742308 seconds
*/
