learngo/14-arrays/exercises/03-array-literal/solution/main.go

// 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 (
	"fmt"
	"strings"
)

func main() {
	// The names of your best three friends
	names := [3]string{
		"Einstein",
		"Tesla",
		"Shepard",
	}

	// The distances to five different locations
	distances := [5]int{50, 40, 75, 30, 125}

	// A data buffer with five bytes of capacity
	data := [5]byte{'H', 'E', 'L', 'L', 'O'}

	// Currency exchange ratios only for a single currency
	ratios := [1]float64{3.14145}

	// Up/Down status of four different web servers
	alives := [4]bool{true, false, true, false}

	// A byte array that doesn't occupy memory space
	//
	// Don't do this:
	//   zero := [0]byte{}
	//
	// Do this (when you don't assign elements):
	var zero [0]byte

	// =========================================================================

	separator := "\n" + strings.Repeat("=", 20) + "\n"

	fmt.Print("names", separator)
	for i := 0; i < len(names); i++ {
		fmt.Printf("names[%d]: %q\n", i, names[i])
	}

	fmt.Print("\ndistances", separator)
	for i := 0; i < len(distances); i++ {
		fmt.Printf("distances[%d]: %d\n", i, distances[i])
	}

	fmt.Print("\ndata", separator)
	for i := 0; i < len(data); i++ {
		// try the %c verb
		fmt.Printf("data[%d]: %d\n", i, data[i])
	}

	fmt.Print("\nratios", separator)
	for i := 0; i < len(ratios); i++ {
		fmt.Printf("ratios[%d]: %.2f\n", i, ratios[i])
	}

	fmt.Print("\nalives", separator)
	for i := 0; i < len(alives); i++ {
		fmt.Printf("alives[%d]: %t\n", i, alives[i])
	}

	// no loop for zero elements
	fmt.Print("\nzero", separator)
	for i := 0; i < len(zero); i++ {
		fmt.Printf("zero[%d]: %d\n", i, zero[i])
	}

	// =========================================================================

	// you know how this works :) don't be freaked out!
	fmt.Printf(`

%s
FOR RANGES
%[1]s

`, strings.Repeat("~", 30))

	fmt.Print("names", separator)
	for i, v := range names {
		fmt.Printf("names[%d]: %q\n", i, v)
	}

	fmt.Print("\ndistances", separator)
	for i, v := range distances {
		fmt.Printf("distances[%d]: %d\n", i, v)
	}

	fmt.Print("\ndata", separator)
	for i, v := range data {
		// try the %c verb
		fmt.Printf("data[%d]: %d\n", i, v)
	}

	fmt.Print("\nratios", separator)
	for i, v := range ratios {
		fmt.Printf("ratios[%d]: %.2f\n", i, v)
	}

	fmt.Print("\nalives", separator)
	for i, v := range alives {
		fmt.Printf("alives[%d]: %t\n", i, v)
	}

	// no loop for zero elements
	fmt.Print("\nzero", separator)
	for i, v := range zero {
		fmt.Printf("zero[%d]: %d\n", i, v)
	}
}