go make efficiency

go_make_efficiency.go

package main

import (
	"fmt"
	"time"
)

func main() {
	msg := "i love golang, which will donimate the next generation of cloud service"
	limit := 10000000

	appendWithCap(msg, limit)
	appendWithoutCap(msg, limit)

}

func appendWithoutCap(msg string, limit int) []string {
	ts := time.Now()
	s := make([]string, 0, 0)
	fmt.Println("AppenWithoutCap:", cap(s))
	for i := 0; i < limit; i++ {
		s = append(s, msg)
	}
	fmt.Println("AppendWithoutCap:", time.Since(ts), len(s), cap(s))
	return s
}

func appendWithCap(msg string, limit int) []string {
	ts := time.Now()
	s := make([]string, 0, limit)
	fmt.Println("AppendWithCap:", cap(s))
	for i := 0; i < limit; i++ {
		s = append(s, msg)
	}
	fmt.Println("AppendWithCap:", time.Since(ts), len(s), cap(s))
	return s
}