Enhance comments for clarity and remove unnecessary lines in 3-paths.js

Author: MohammedNaru

Sprint-1/1-key-exercises/3-paths.js

@@ -1,4 +1,4 @@
-// The diagram below shows the different names for parts of a file path on a Unix operating system
+/// The diagram below shows the different names for parts of a file path on a Unix operating system
 
 // ┌─────────────────────┬────────────┐
 // │          dir        │    base    │
@@ -7,20 +7,27 @@
 // "  /    home/user/dir / file  .txt "
 // └──────┴──────────────┴──────┴─────┘
 
-// (All spaces in the "" line should be ignored. They are purely for formatting.)
-
 const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt";
+
+// Find last slash to separate dir and base
 const lastSlashIndex = filePath.lastIndexOf("/");
+
+// base = name + ext (e.g. "file.txt")
 const base = filePath.slice(lastSlashIndex + 1);
 console.log(`The base part of ${filePath} is ${base}`);
 
-// Create a variable to store the dir part of the filePath variable
-// Create a variable to store the ext part of the variable
-
+// dir = everything before the last slash
 const dir = filePath.slice(0, lastSlashIndex);
-const ext = filePath.slice(lastSlashIndex); 
 
+// Find last dot to extract only extension
+const lastDotIndex = filePath.lastIndexOf(".");
+
+// ext = everything from the last dot onward
+const ext = filePath.slice(lastDotIndex);
 
 console.log(`The dir part of ${filePath} is ${dir}`);
 console.log(`The ext part of ${filePath} is ${ext}`);
-// https://www.google.com/search?q=slice+mdn
+
+// https://www.google.com/search?q=slice+mdn
+
+