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 (
	"fmt"
)

func main() {
	// for keeping things easy to read and type-safe
	type placeholder [5]string

	zero := placeholder{
		"███",
		"█ █",
		"█ █",
		"█ █",
		"███",
	}

	one := placeholder{
		"██ ",
		" █ ",
		" █ ",
		" █ ",
		"███",
	}

	two := placeholder{
		"███",
		"  █",
		"███",
		"█  ",
		"███",
	}

	three := placeholder{
		"███",
		"  █",
		"███",
		"  █",
		"███",
	}

	four := placeholder{
		"█ █",
		"█ █",
		"███",
		"  █",
		"  █",
	}

	five := placeholder{
		"███",
		"█  ",
		"███",
		"  █",
		"███",
	}

	six := placeholder{
		"███",
		"█  ",
		"███",
		"█ █",
		"███",
	}

	seven := placeholder{
		"███",
		"  █",
		"  █",
		"  █",
		"  █",
	}

	eight := placeholder{
		"███",
		"█ █",
		"███",
		"█ █",
		"███",
	}

	nine := placeholder{
		"███",
		"█ █",
		"███",
		"  █",
		"███",
	}

	// This array's type is "like": [10][5]string
	//
	// However:
	// + "placeholder" is not equal to [5]string in type-wise.
	// + Because: "placeholder" is a defined type, which is different
	//   from [5]string type.
	// + [5]string is an unnamed type.
	// + placeholder is a named type.
	// + The underlying type of [5]string and placeholder is the same:
	//     [5]string
	digits := [...]placeholder{
		zero, one, two, three, four, five, six, seven, eight, nine,
	}

	// Explanation: digits[0]
	// + Each element of clock has the same length.
	// + So: Getting the length of only one element is OK.
	// + This could be: "zero" or "one" and so on... Instead of: digits[0]
	//
	// The range clause below is ~equal to the following code:
	// line := 0; line < 5; line++
	for line := range digits[0] {
		// Print a line for each placeholder in digits
		for digit := range digits {
			fmt.Print(digits[digit][line], "  ")
		}
		fmt.Println()
	}
}

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