str_bench.go

package main

import (
	"fmt"
	"math/rand"
	"strings"
	"time"
)

func main() {
	rand.Seed(int64(time.Now().Nanosecond()))
	var arr []string
	for i := 0; i < 1000000; i++ {
		strLen := rand.Int() % 10
		arr = append(arr, strings.Repeat("a", strLen))
	}
	start := time.Now()
	for i := 0; i < 1000000-4; i++ {
		checkStrLenMath(arr[i], arr[i+1], arr[i+2], arr[i+3])
	}
	elapsed := time.Since(start)
	fmt.Printf("checkStrLenMath took %d \n", elapsed)

	start = time.Now()
	for i := 0; i < 1000000-4; i++ {
		checkStrLen(arr[i], arr[i+1], arr[i+2], arr[i+3])
	}
	elapsed = time.Since(start)
	fmt.Printf("checkStrLen took %d\n", elapsed)

	start = time.Now()
	for i := 0; i < 1000000-4; i++ {
		checkStrLenX(arr[i], arr[i+1], arr[i+2], arr[i+3])
	}
	elapsed = time.Since(start)
	fmt.Printf("checkStrLenX took %d\n", elapsed)
}

func checkStrLenMath(as, bs, cs, ds string) bool {
	a := len(as)
	b := len(bs)
	c := len(cs)
	d := len(ds)
	return (a+b+c+d == 0) || (a*b*c*d != 0)
}

func checkStrLen(as, bs, cs, ds string) bool {
	a := len(as)
	b := len(bs)
	c := len(cs)
	d := len(ds)
	return (a == 0 && b == 0 && c == 0 && d == 0) || (a != 0 && b != 0 && c != 0 && d != 0)
}

func checkStrLenX(as, bs, cs, ds string) bool {
	return (len(as) == 0 && len(bs) == 0 && len(cs) == 0 &&
		len(ds) == 0) || (len(as) != 0 && len(bs) != 0 && len(cs) != 0 && len(ds) != 0)
}