restructure: arrays and slices

15-project-retro-led-clock/exercises/03-split-second/main.go

@@ -0,0 +1,147 @@
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+// ---------------------------------------------------------
+// EXERCISE: Add Split Seconds
+//
+//  Your goal is adding the split second to the clock. A split second is
+//  1/10th of a second.
+//
+//  1. Find the current split second
+//  2. Add dot character to the clock (as in the expected output)
+//  3. Add the split second digit to the clock
+//  4. Blink the dot every two seconds (just like the separators)
+//  5. Update the clock every 1/10th of a second, instead of every second.
+//     (Update the clock every 100 millliseconds)
+//
+// HINTS
+//   + You can find the split second using Nanosecond method of the Time type.
+//     https://golang.org/pkg/time/#Time.Nanosecond
+//
+//   + A split second is the first digit of the Nanosecond.
+//
+//   + Remember: time.Second is an integer constant, so it can be divided
+//               with a number.
+//
+//     https://golang.org/pkg/time/#Time.Second
+//
+// EXPECTED OUTPUT
+//     Note that, clock is updated every split second instead of a second.
+//
+//     Separators are displayed (second is an odd number):
+//
+//     ██   ██        ███  ██        ██   ███       ███
+//      █    █    ░   █     █    ░    █     █       █ █
+//      █    █        ███   █         █     █       █ █
+//      █    █    ░     █   █    ░    █     █       █ █
+//     ███  ███       ███  ███       ███    █   ░   ███
+//
+//     ██   ██        ███  ██        ██   ███       ██
+//      █    █    ░   █     █    ░    █     █        █
+//      █    █        ███   █         █     █        █
+//      █    █    ░     █   █    ░    █     █        █
+//     ███  ███       ███  ███       ███    █   ░   ███
+//
+//     ██   ██        ███  ██        ██   ███       ███
+//      █    █    ░   █     █    ░    █     █         █
+//      █    █        ███   █         █     █       ███
+//      █    █    ░     █   █    ░    █     █       █
+//     ███  ███       ███  ███       ███    █   ░   ███
+//
+//     ██   ██        ███  ██        ██   ███       ███
+//      █    █    ░   █     █    ░    █     █         █
+//      █    █        ███   █         █     █       ███
+//      █    █    ░     █   █    ░    █     █         █
+//     ███  ███       ███  ███       ███    █   ░   ███
+//
+//     ██   ██        ███  ██        ██   ███       █ █
+//      █    █    ░   █     █    ░    █     █       █ █
+//      █    █        ███   █         █     █       ███
+//      █    █    ░     █   █    ░    █     █         █
+//     ███  ███       ███  ███       ███    █   ░     █
+//
+//     ██   ██        ███  ██        ██   ███       ███
+//      █    █    ░   █     █    ░    █     █       █
+//      █    █        ███   █         █     █       ███
+//      █    █    ░     █   █    ░    █     █         █
+//     ███  ███       ███  ███       ███    █   ░   ███
+//
+//     ██   ██        ███  ██        ██   ███       ███
+//      █    █    ░   █     █    ░    █     █       █
+//      █    █        ███   █         █     █       ███
+//      █    █    ░     █   █    ░    █     █       █ █
+//     ███  ███       ███  ███       ███    █   ░   ███
+//
+//     ██   ██        ███  ██        ██   ███       ███
+//      █    █    ░   █     █    ░    █     █         █
+//      █    █        ███   █         █     █         █
+//      █    █    ░     █   █    ░    █     █         █
+//     ███  ███       ███  ███       ███    █   ░     █
+//
+//     ██   ██        ███  ██        ██   ███       ███
+//      █    █    ░   █     █    ░    █     █       █ █
+//      █    █        ███   █         █     █       ███
+//      █    █    ░     █   █    ░    █     █       █ █
+//     ███  ███       ███  ███       ███    █   ░   ███
+//
+//     ██   ██        ███  ██        ██   ███       ███
+//      █    █    ░   █     █    ░    █     █       █ █
+//      █    █        ███   █         █     █       ███
+//      █    █    ░     █   █    ░    █     █         █
+//     ███  ███       ███  ███       ███    █   ░   ███
+//
+//     Separators are not displayed (second is an even number):
+//
+//     ██   ██        ███  ██        ██   ███       ███
+//      █    █        █     █         █   █ █       █ █
+//      █    █        ███   █         █   ███       █ █
+//      █    █          █   █         █   █ █       █ █
+//     ███  ███       ███  ███       ███  ███       ███
+//
+// ---------------------------------------------------------
+
+package main
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/inancgumus/screen"
+)
+
+func main() {
+	screen.Clear()
+
+	for {
+		screen.MoveTopLeft()
+
+		now := time.Now()
+		hour, min, sec := now.Hour(), now.Minute(), now.Second()
+
+		clock := [...]placeholder{
+			digits[hour/10], digits[hour%10],
+			colon,
+			digits[min/10], digits[min%10],
+			colon,
+			digits[sec/10], digits[sec%10],
+		}
+
+		for line := range clock[0] {
+			for index, digit := range clock {
+				// colon blink
+				next := clock[index][line]
+				if digit == colon && sec%2 == 0 {
+					next = "   "
+				}
+				fmt.Print(next, "  ")
+			}
+			fmt.Println()
+		}
+
+		time.Sleep(time.Second)
+	}
+}

15-project-retro-led-clock/exercises/03-split-second/placeholders.go

@@ -0,0 +1,95 @@
+package main
+
+type placeholder [5]string
+
+var zero = placeholder{
+	"███",
+	"█ █",
+	"█ █",
+	"█ █",
+	"███",
+}
+
+var one = placeholder{
+	"██ ",
+	" █ ",
+	" █ ",
+	" █ ",
+	"███",
+}
+
+var two = placeholder{
+	"███",
+	"  █",
+	"███",
+	"█  ",
+	"███",
+}
+
+var three = placeholder{
+	"███",
+	"  █",
+	"███",
+	"  █",
+	"███",
+}
+
+var four = placeholder{
+	"█ █",
+	"█ █",
+	"███",
+	"  █",
+	"  █",
+}
+
+var five = placeholder{
+	"███",
+	"█  ",
+	"███",
+	"  █",
+	"███",
+}
+
+var six = placeholder{
+	"███",
+	"█  ",
+	"███",
+	"█ █",
+	"███",
+}
+
+var seven = placeholder{
+	"███",
+	"  █",
+	"  █",
+	"  █",
+	"  █",
+}
+
+var eight = placeholder{
+	"███",
+	"█ █",
+	"███",
+	"█ █",
+	"███",
+}
+
+var nine = placeholder{
+	"███",
+	"█ █",
+	"███",
+	"  █",
+	"███",
+}
+
+var colon = placeholder{
+	"   ",
+	" ░ ",
+	"   ",
+	" ░ ",
+	"   ",
+}
+
+var digits = [...]placeholder{
+	zero, one, two, three, four, five, six, seven, eight, nine,
+}

15-project-retro-led-clock/exercises/03-split-second/solution/main.go

@@ -0,0 +1,51 @@
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/inancgumus/screen"
+)
+
+func main() {
+	screen.Clear()
+
+	for {
+		screen.MoveTopLeft()
+
+		now := time.Now()
+		hour, min, sec := now.Hour(), now.Minute(), now.Second()
+		ssec := now.Nanosecond() / 1e8
+
+		clock := [...]placeholder{
+			digits[hour/10], digits[hour%10],
+			colon,
+			digits[min/10], digits[min%10],
+			colon,
+			digits[sec/10], digits[sec%10],
+			dot,
+			digits[ssec],
+		}
+
+		for line := range clock[0] {
+			for index, digit := range clock {
+				next := clock[index][line]
+				if (digit == colon || digit == dot) && sec%2 == 0 {
+					next = "   "
+				}
+				fmt.Print(next, "  ")
+			}
+			fmt.Println()
+		}
+
+		const splitSecond = time.Second / 10
+		time.Sleep(splitSecond)
+	}
+}

15-project-retro-led-clock/exercises/03-split-second/solution/placeholders.go

@@ -0,0 +1,103 @@
+package main
+
+type placeholder [5]string
+
+var zero = placeholder{
+	"███",
+	"█ █",
+	"█ █",
+	"█ █",
+	"███",
+}
+
+var one = placeholder{
+	"██ ",
+	" █ ",
+	" █ ",
+	" █ ",
+	"███",
+}
+
+var two = placeholder{
+	"███",
+	"  █",
+	"███",
+	"█  ",
+	"███",
+}
+
+var three = placeholder{
+	"███",
+	"  █",
+	"███",
+	"  █",
+	"███",
+}
+
+var four = placeholder{
+	"█ █",
+	"█ █",
+	"███",
+	"  █",
+	"  █",
+}
+
+var five = placeholder{
+	"███",
+	"█  ",
+	"███",
+	"  █",
+	"███",
+}
+
+var six = placeholder{
+	"███",
+	"█  ",
+	"███",
+	"█ █",
+	"███",
+}
+
+var seven = placeholder{
+	"███",
+	"  █",
+	"  █",
+	"  █",
+	"  █",
+}
+
+var eight = placeholder{
+	"███",
+	"█ █",
+	"███",
+	"█ █",
+	"███",
+}
+
+var nine = placeholder{
+	"███",
+	"█ █",
+	"███",
+	"  █",
+	"███",
+}
+
+var colon = placeholder{
+	"   ",
+	" ░ ",
+	"   ",
+	" ░ ",
+	"   ",
+}
+
+var dot = placeholder{
+	"   ",
+	"   ",
+	"   ",
+	"   ",
+	" ░ ",
+}
+
+var digits = [...]placeholder{
+	zero, one, two, three, four, five, six, seven, eight, nine,
+}