feat(m4): add solution exe-001 display-the-head-of-a-file

projects/m4/001-display-the-head-of-a-file/js/example.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.

projects/m4/001-display-the-head-of-a-file/js/example2.txt

@@ -0,0 +1,4 @@
+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.

projects/m4/001-display-the-head-of-a-file/js/example3.txt

@@ -0,0 +1,5 @@
+Ciao come stai?
+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.

projects/m4/001-display-the-head-of-a-file/js/index.js

@@ -0,0 +1,36 @@
+const { readFile } = require('fs/promises');
+let filePath = './example.txt';
+let filePath2 = './example2.txt';
+let filePath3 = './example3.txt';
+const numberLines = 5;
+
+readFile(filePath)
+    .then((data) => {
+        console.log(data.toString().split('\r\n').slice(0, 10).join('\r\n')); // The first 10 lines
+        console.log(
+            data.toString().split('\r\n').slice(0, numberLines).join('\r\n') // The first 5 lines
+        );
+        console.log(
+            // The first 3 lines
+            `${filePath}\n ${data
+                .toString()
+                .split('\r\n')
+                .slice(0, numberLines - 2)
+                .join('\r\n')}`
+        );
+    })
+
+    .catch((error) => {
+        console.log(error);
+    });
+
+// Multiple files
+Promise.all([readFile(filePath), readFile(filePath2), readFile(filePath3)])
+    .then(([data1, data2, data3]) => {
+        console.log(data1.toString().split('\r\n').slice(0, 1).join('\r\n'));
+        console.log(data2.toString().split('\r\n').slice(0, 1).join('\r\n'));
+        console.log(data3.toString().split('\r\n').slice(0, 1).join('\r\n'));
+    })
+    .catch((error) => {
+        console.log(error);
+    });