Golang golang-pointerperformace (snippet)

Go programming example 'golang-pointerperformace'

golang-pointerperformace

Golang beginners example: golang-pointerperformace

package main

import (
    "log"
    "time"
)

func plusP(in *int) {
    *in = *in + 1
}

func plusPpp(in *int) {
    *in++
}

func plus(in int) int {
    return in + 1
}

func main() {
    var value int
    var start time.Time
    var elapsed time.Duration

    value = 5

    start = time.Now()

    for i := 0; i < 1600000; i++ {
        plusP(&value)
    }

    elapsed = time.Since(start)
    log.Printf("calculated %v with pointer took: %s", value, elapsed)

    value = 5

    start = time.Now()

    for i := 0; i < 1600000; i++ {
        plusPpp(&value)
    }

    elapsed = time.Since(start)
    log.Printf("calculated %v with pointer (++) took: %s", value, elapsed)

    value = 5

    start = time.Now()

    for i := 0; i < 1600000; i++ {
        value = plus(value)
    }

    elapsed = time.Since(start)
    log.Printf("calculated %v without pointer took: %s", value, elapsed)
}

Useful links

• Learn Go: https://golangr.com
• Download Go: https://golang.org