added solution to 3-paths.js

Author: Alex Jamshidi

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

@@ -17,7 +17,15 @@ 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
 
-const dir = ;
-const ext = ;
+const lastDotIndex = filePath.lastIndexOf(".");
+
+const dir = filePath.slice(1, lastSlashIndex);
+const ext = filePath.slice(lastDotIndex);
+
+// Checks
+
+console.log(`The directory part of ${filePath} is ${dir}`);
+console.log(`The extension part of ${filePath} is ${ext}`);
+
 
 // https://www.google.com/search?q=slice+mdn