gistfile1.txt

package main

import (
	"fmt"
	"sync"
	"time"
)

const n = 1000000000

var m sync.Mutex

func withLambda() {
	m.Lock()
	defer func() { m.Unlock() }()
}

func withoutLambda() {
	m.Lock()
	defer m.Unlock()
}

func main() {
	t1 := time.Now()
	for i := 0; i < n; i++ {
		withLambda()
	}
	fmt.Printf("With lambda: %f ns\n", float64(time.Since(t1).Nanoseconds()) / n)
	//
	t2 := time.Now()
	for i := 0; i < n; i++ {
		withoutLambda()
	}
	fmt.Printf("Without lambda: %f ns\n", float64(time.Since(t2).Nanoseconds()) / n)
}