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Node.js Express: API & CLI Apps
Node.js Express: API & CLI Apps
Console App: DirInspect Pro
This chapter presents you with a challenge: creating an advanced console app named DirInspect Pro. This app will empower you to thoroughly analyze any directory and gain insightful statistics about its files and subdirectories.
🏆 Challenge Awaits
Picture a scenario where you must navigate a labyrinth of folders containing crucial files and data. DirInspect Pro is your ally in this journey, providing comprehensive insights into the directory's structure and contents.
🚀 The Resulting App
Get ready to wield DirInspect Pro's capabilities. The app will furnish you with critical information, such as
- The total number of items;
- The aggregate size of all items;
- The largest file's name and size;
- The detailed list of individual file names and sizes.
Two Paths to Choose
You have two paths ahead.
- The first is to tackle this challenge head-on, honing your skills without guidance;
- The second is to follow a helpful guide that guarantees your success.
Whichever path you choose, you're in for a rewarding journey culminating in creating a captivating and functional console app.
Masterplan
- 👉 Step 1: Import Required Modules;
- 👉 Step 2: Define getStats Function;
- 👉 Step 3: Define analyzeFile Function;
- 👉 Step 4: Define analyzeDirectory Function;
- 👉 Step 5: Define main Function and Invoke;
- 🎉 Conclusion;
- 🏁 Full App Code.
Step 1: Import Required Modules
To embark on this adventure, you'll need the right tools. Begin by importing two key modules: fs.promises
to manage the file system asynchronously and path
to handle file paths effectively.
Step 2: Define getStats Function
The asynchronous function, getStats
, takes a file or directory path as an argument and attempts to retrieve its statistics using fs.stat
.
- If successful, it returns the statistics;
- If an error occurs, it logs an error message and returns
null
.
Step 3: Define analyzeFile Function
The analyzeFile
function uses the getStats
function to obtain statistics for a file. If statistics are available (not null
), it returns an object containing the file's name (extracted using path.basename
) and its size.
Step 4: Define analyzeDirectory Function
The analyzeDirectory
function takes a directory path as an argument and comprehensively analyzes its contents.
- It begins by reading the items within the directory using
fs.readdir
and then iterates through each item; - For each item, it constructs the full path using
path.join
and retrieves its statistics using thegetStats
function; - If the
stats
indicate that the item is a file, it updates file-related statistics; - If the item is a subdirectory, it recursively calls the
analyzeDirectory
function to analyze its contents and then aggregates the statistics.
Step 5: Define main Function and Invoke
The main
function is the entry point of the script. It specifies the directory path to analyze (in this case, ./docs
), calls the analyzeDirectory
function to obtain the statistics of the directory and its contents, and then outputs the collected information.
The function prints out
- The total number of items;
- The total number of files;
- The total size;
- The details about the largest file;
- The list of files in the directory.
🎉 Conclusion: Mastered Skills
With DirInspect Pro, you've mastered the art of analyzing directories like a pro. This console app showcases your ability to extract file statistics, handle errors seamlessly, and unveil meaningful insights about files and subdirectories within a specified directory.
👨💻 Full App Code
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