add: new input scanning exercises

23-input-scanning/exercises/02-unique-words/main.go

@@ -10,8 +10,8 @@ package main
 // ---------------------------------------------------------
 // EXERCISE: Unique Words
 //
-//  Create a program that counts the unique words from an
-//  input stream.
+//  Create a program that prints the total and unique words
+//  from an input stream.
 //
 //  1. Feed the shakespeare.txt to your program.
 //
@@ -21,8 +21,13 @@ package main
 //
 //  4. Count the unique words using a map.
 //
+//  5. Print the total and unique words.
+//
+//
 // EXPECTED OUTPUT
+//
 //  There are 99 words, 70 of them are unique.
+//
 // ---------------------------------------------------------
 
 func main() {

23-input-scanning/exercises/03-unique-words-2/main.go

@@ -0,0 +1,39 @@
+// 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
+
+// ---------------------------------------------------------
+// EXERCISE: Unique Words 2
+//
+//  Use your solution from the previous "Unique Words"
+//  exercise.
+//
+//  Before adding the words to your map, remove the
+//  punctuation characters and numbers from them.
+//
+//
+// BE CAREFUL
+//
+//  Now the shakespeare.txt contains upper and lower
+//  case letters too.
+//
+//
+// EXPECTED OUTPUT
+//
+//  go run main.go < shakespeare.txt
+//
+//   There are 100 words, 69 of them are unique.
+//
+// ---------------------------------------------------------
+
+func main() {
+	// This is the regular expression pattern you need to use:
+	// [^A-Za-z]+
+	//
+	// Matches to any character but upper case and lower case letters
+}

23-input-scanning/exercises/03-unique-words-2/shakespeare.txt

@@ -0,0 +1,12 @@
+Come, night. Come, Romeo. Come, thou day in night,
+For thou wilt lie upon the wings of night
+Whiter than new snow upon a raven’s back.
+Come, gentle night, come, loving, black-browed night,
+Give me my Romeo. And when I shall die,
+Take him and cut him out in little stars,
+And he will make the face of heaven so fine
+That all the world will be in love with night
+And pay no worship to the garish sun.
+Oh, I have bought the mansion of a love,
+But not possessed it, and though I am sold,
+Not yet enjoyed.

23-input-scanning/exercises/03-unique-words-2/solution/main.go

@@ -0,0 +1,35 @@
+package main
+
+// 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/
+//
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"regexp"
+	"strings"
+)
+
+func main() {
+	in := bufio.NewScanner(os.Stdin)
+	in.Split(bufio.ScanWords)
+
+	rx := regexp.MustCompile(`[^A-Za-z]+`)
+
+	total, words := 0, make(map[string]int)
+	for in.Scan() {
+		total++
+
+		word := rx.ReplaceAllString(in.Text(), "")
+		word = strings.ToLower(word)
+		words[word]++
+	}
+
+	fmt.Printf("There are %d words, %d of them are unique.\n",
+		total, len(words))
+}

23-input-scanning/exercises/03-unique-words-2/solution/shakespeare.txt

@@ -0,0 +1,12 @@
+Come, night. Come, Romeo. Come, thou day in night,
+For thou wilt lie upon the wings of night
+Whiter than new snow upon a raven’s back.
+Come, gentle night, come, loving, black-browed night,
+Give me my Romeo. And when I shall die,
+Take him and cut him out in little stars,
+And he will make the face of heaven so fine
+That all the world will be in love with night
+And pay no worship to the garish sun.
+Oh, I have bought the mansion of a love,
+But not possessed it, and though I am sold,
+Not yet enjoyed.

23-input-scanning/exercises/04-grep/main.go

@@ -15,10 +15,14 @@ package main
 //
 //  4. If no pattern is provided, print all the lines
 //
+//
 // EXPECTED OUTPUT
+//
 //  go run main.go come < shakespeare.txt
+//
 //    come night come romeo come thou day in night
 //    come gentle night come loving black-browed night
+//
 // ---------------------------------------------------------
 
 func main() {

23-input-scanning/exercises/05-quit/main.go

@@ -0,0 +1,32 @@
+package main
+
+// ---------------------------------------------------------
+// EXERCISE: Quit
+//
+//  Create a program that quits when a user types the
+//  same word twice.
+//
+//
+// RESTRICTION
+//
+//  The program should work case insensitive.
+//
+//
+// EXPECTED OUTPUT
+//
+//  go run main.go
+//
+//   hey
+//   HEY
+//   TWICE!
+//
+//  go run main.go
+//
+//   hey
+//   hi
+//   HEY
+//   TWICE!
+// ---------------------------------------------------------
+
+func main() {
+}

23-input-scanning/exercises/05-quit/solution/main.go

@@ -0,0 +1,30 @@
+// 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 (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+func main() {
+	in := bufio.NewScanner(os.Stdin)
+
+	words := make(map[string]bool)
+	for in.Scan() {
+		w := strings.ToLower(in.Text())
+
+		if words[w] {
+			fmt.Println("TWICE!")
+			return
+		}
+		words[in.Text()] = true
+	}
+}

23-input-scanning/exercises/06-log-parser/log.txt

@@ -0,0 +1,6 @@
+learngoprogramming.com 10
+learngoprogramming.com 10
+golang.org 4
+golang.org 6
+blog.golang.org 20
+blog.golang.org 10

23-input-scanning/exercises/06-log-parser/log_err_missing.txt

@@ -0,0 +1,6 @@
+learngoprogramming.com 10
+learngoprogramming.com 10
+golang.org
+golang.org 6
+blog.golang.org 20
+blog.golang.org 10

23-input-scanning/exercises/06-log-parser/log_err_negative.txt

@@ -0,0 +1,6 @@
+learngoprogramming.com 10
+learngoprogramming.com 10
+golang.org -100
+golang.org 6
+blog.golang.org 20
+blog.golang.org 10

23-input-scanning/exercises/06-log-parser/log_err_str.txt

@@ -0,0 +1,6 @@
+learngoprogramming.com 10
+learngoprogramming.com 10
+golang.org FOUR
+golang.org 6
+blog.golang.org 20
+blog.golang.org 10

23-input-scanning/exercises/06-log-parser/main.go

@@ -0,0 +1,41 @@
+package main
+
+// ---------------------------------------------------------
+// EXERCISE: Log Parser from Stratch
+//
+//  You've watched the lecture. Now, try to create the same
+//  log parser program on your own. Do not look at the lecture,
+//  and the existing source code.
+//
+//
+// EXPECTED OUTPUT
+//
+//  go run main.go < log.txt
+//
+//   DOMAIN                             VISITS
+//   ---------------------------------------------
+//   blog.golang.org                        30
+//   golang.org                             10
+//   learngoprogramming.com                 20
+//
+//   TOTAL                                  60
+//
+//
+//  go run main.go < log_err_missing.txt
+//
+//   wrong input: [golang.org] (line #3)
+//
+//
+//  go run main.go < log_err_negative.txt
+//
+//   wrong input: "-100" (line #3)
+//
+//
+//  go run main.go < log_err_str.txt
+//
+//   wrong input: "FOUR" (line #3)
+//
+// ---------------------------------------------------------
+
+func main() {
+}

23-input-scanning/exercises/README.md

@@ -2,14 +2,28 @@
 
 Let's exercise with the scanner and maps.
 
-1. **[Uppercaser](https://github.com/inancgumus/learngo/tree/master/23-project-log-parser/exercises/01-uppercaser)**
+1. **[Uppercaser](https://github.com/inancgumus/learngo/tree/master/23-input-scanning/exercises/01-uppercaser)**
 
   Use a scanner to convert the lines to uppercase, and print them.
    
-2. **[Unique Words](https://github.com/inancgumus/learngo/tree/master/23-project-log-parser/exercises/02-unique-words)**
+2. **[Unique Words](https://github.com/inancgumus/learngo/tree/master/23-input-scanning/exercises/02-unique-words)**
 
   Create a program that counts the unique words from an input stream.
 
-3. **[Grep Clone](https://github.com/inancgumus/learngo/tree/master/23-project-log-parser/exercises/03-grep)**
+3. **[Unique Words 2](https://github.com/inancgumus/learngo/tree/master/23-input-scanning/exercises/03-unique-words-2)**
 
-  Create a grep clone. grep is a command-line utility for searching plain-text data for lines that match a specific pattern.
+  Enhance the previous exercise: Before adding the words to your map, remove the punctuation characters and numbers from them.
+
+4. **[Grep Clone](https://github.com/inancgumus/learngo/tree/master/23-input-scanning/exercises/04-grep)**
+
+  Create a grep clone. grep is a command-line utility for searching plain-text data for lines that match a specific pattern.
+
+5. **[Quit](https://github.com/inancgumus/learngo/tree/master/23-input-scanning/exercises/05-quit)**
+
+  Create a program that quits when a user types the same word twice.
+
+6. **[Create the Log Parser program from scratch](https://github.com/inancgumus/learngo/tree/master/23-input-scanning/exercises/06-log-parser)**
+
+  You've watched the lecture. Now, try to create the same log parser program on your own. Do not look at the lecture, and the existing source code.
+
+  Click the link for more details.