go main

main.go 源码

// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials  : https://learngoprogramming.com
// In-person training  : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus

package main

import (
	"strings"

	s "github.com/inancgumus/prettyslice"
)

func main() {
	s.PrintBacking = true
	s.MaxPerLine = 10

	// #1: assume that tasks can be a long list
	// ---------------------------------------------
	tasks := []string{"jump", "run", "read"}

	// #2: INEFFICIENT WAY
	// ---------------------------------------------
	// var upTasks []string
	// s.Show("upTasks", upTasks)

	// for _, task := range tasks {
	// 	upTasks = append(upTasks, strings.ToUpper(task))
	// 	s.Show("upTasks", upTasks)
	// }

	// #3: SO SO WAY:
	// ---------------------------------------------
	// upTasks := make([]string, len(tasks))
	// s.Show("upTasks", upTasks)

	// for _, task := range tasks {
	// 	upTasks = append(upTasks, strings.ToUpper(task))
	// 	s.Show("upTasks", upTasks)
	// }

	// #4: SO SO WAY 2:
	// ---------------------------------------------
	// upTasks := make([]string, len(tasks))
	// s.Show("upTasks", upTasks)

	// for i, task := range tasks {
	// 	upTasks[i] = strings.ToUpper(task)
	// 	s.Show("upTasks", upTasks)
	// }

	// #5: allocates a new array
	// upTasks = append(upTasks, "PLAY")
	// s.Show("upTasks", upTasks)

	// #6: SO SO WAY 3
	// ---------------------------------------------
	// upTasks := make([]string, 0, len(tasks))

	// #7
	// upTasks = upTasks[:cap(upTasks)]

	// #6
	// s.Show("upTasks", upTasks)

	// for i, task := range tasks {
	// 	upTasks[i] = strings.ToUpper(task)
	// 	s.Show("upTasks", upTasks)
	// }

	// #8: THE BEST WAY
	// ---------------------------------------------
	upTasks := make([]string, 0, len(tasks))

	s.Show("upTasks", upTasks)

	for _, task := range tasks {
		upTasks = append(upTasks, strings.ToUpper(task))
		s.Show("upTasks", upTasks)
	}
}

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