From c1bf6ab53f0065af09ee7cd090779ba5c9ad0828 Mon Sep 17 00:00:00 2001
From: AlessandroVerzella
 <116301354+AlessandroVerzella@users.noreply.github.com>
Date: Sat, 15 Jul 2023 12:10:56 +0200
Subject: [PATCH 1/4] added a console.log instruction

---
 projects/m1/001-area-of-a-room/js/index.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/projects/m1/001-area-of-a-room/js/index.js b/projects/m1/001-area-of-a-room/js/index.js
index e69de29bb..66c7ece20 100644
--- a/projects/m1/001-area-of-a-room/js/index.js
+++ b/projects/m1/001-area-of-a-room/js/index.js
@@ -0,0 +1 @@
+console.log('aaa');

From 66f5b5d19e2ea09f38877109b2d91f2719ce10de Mon Sep 17 00:00:00 2001
From: AlessandroVerzella
 <116301354+AlessandroVerzella@users.noreply.github.com>
Date: Sat, 15 Jul 2023 12:13:16 +0200
Subject: [PATCH 2/4] add a second console log

---
 projects/m1/001-area-of-a-room/js/index.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/projects/m1/001-area-of-a-room/js/index.js b/projects/m1/001-area-of-a-room/js/index.js
index 66c7ece20..a1be9412c 100644
--- a/projects/m1/001-area-of-a-room/js/index.js
+++ b/projects/m1/001-area-of-a-room/js/index.js
@@ -1 +1,3 @@
 console.log('aaa');
+
+console.log('bbb');

From fb2e8d5b625f99798a1c151b734e3fd13e101d59 Mon Sep 17 00:00:00 2001
From: AlessandroVerzella
 <116301354+AlessandroVerzella@users.noreply.github.com>
Date: Sat, 15 Jul 2023 12:15:02 +0200
Subject: [PATCH 3/4] removed console.logs

---
 projects/m1/001-area-of-a-room/js/index.js | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/projects/m1/001-area-of-a-room/js/index.js b/projects/m1/001-area-of-a-room/js/index.js
index a1be9412c..e69de29bb 100644
--- a/projects/m1/001-area-of-a-room/js/index.js
+++ b/projects/m1/001-area-of-a-room/js/index.js
@@ -1,3 +0,0 @@
-console.log('aaa');
-
-console.log('bbb');

From ebd743d09d5040e0fcb5f70d730c1dc9b085aa1e Mon Sep 17 00:00:00 2001
From: AlessandroVerzella <alessandro.verzella@web.de>
Date: Wed, 9 Oct 2024 07:47:10 +0200
Subject: [PATCH 4/4] Added the solution of the exercise

---
 .../004-letter-frequencies/js/exercise1.txt   | 24 ++++++++++++++++++
 .../m4/004-letter-frequencies/js/index.js     | 25 +++++++++++++++++++
 2 files changed, 49 insertions(+)
 create mode 100644 projects/m4/004-letter-frequencies/js/exercise1.txt

diff --git a/projects/m4/004-letter-frequencies/js/exercise1.txt b/projects/m4/004-letter-frequencies/js/exercise1.txt
new file mode 100644
index 000000000..fbc36b634
--- /dev/null
+++ b/projects/m4/004-letter-frequencies/js/exercise1.txt
@@ -0,0 +1,24 @@
+Line 1: This is the first line.
+Line 2: This is the second line.
+Line 3: This is the third line.
+Line 4: This is the fourth line.
+Line 5: This is the fifth line.
+Line 6: This is the sixth line.
+Line 7: This is the seventh line.
+Line 8: This is the eighth line.
+Line 9: This is the ninth line.
+Line 10: This is the tenth line.
+Line 11: This is the eleventh line.
+Line 12: This is the twelfth line.
+Line 13: This is the thirteenth line.
+Line 14: This is the fourteenth line.
+Line 15: This is the fifteenth line.
+Line 16: This is the sixteenth line.
+Line 17: This is the seventeenth line.
+Line 18: This is the eighteenth line.
+Line 19: This is the nineteenth line.
+Line 20: This is the twentieth line.
+Line 21: This is the twenty-first line.
+Line 22: This is the twenty-second line.
+Line 23: This is the twenty-third line.
+Line 24: This is the twenty-fourth line.
\ No newline at end of file
diff --git a/projects/m4/004-letter-frequencies/js/index.js b/projects/m4/004-letter-frequencies/js/index.js
index e69de29bb..50de6f7e4 100644
--- a/projects/m4/004-letter-frequencies/js/index.js
+++ b/projects/m4/004-letter-frequencies/js/index.js
@@ -0,0 +1,25 @@
+const { error } = require('console');
+const { readFile } = require('fs/promises');
+
+let filePath = './exercise1.txt';
+
+readFile(filePath)
+    .then((data) => {
+        // Convert the string to an array replacing all characters that are not letters
+        let data1 = data
+            .toString()
+            .replace(/[0-9.,\/#!$%\^&\*;:{}=\-_`~(),' ', \r\n]/g, '')
+            .split('');
+
+        const count = {}; // It allows us to calculate the number of times a character in the file repeats or appears
+
+        data1.forEach((value) => {
+            const arr = count[value] ?? 0; // Nulling coalescing operator to start with 0 if count[value] is undefined or null
+            count[value] = arr + 1;
+        });
+
+        console.log(count);
+    })
+    .catch((error) => {
+        console.error('The program is unable to open the file you indicated');
+    });