fs

1. Writing to a File

// let content = "yashaswa is the best coder";
// let path = "output.txt";
// fs::write(path, content)

fs::write writes text to a file.
If the file does not exist, it creates one.
If the file exists, it overwrites it.
Always handle errors with match to avoid silent failures.

2. Reading from a File

// let path = "output.txt";
// fs::read_to_string(path)

fs::read_to_string reads a file’s full content into a String.
Works best for small to medium text files.
Always check for errors (e.g., missing file or permission issue).

3. Directory Operations

let dir_path = "my_app_data";
fs::create_dir_all(dir_path)

create_dir_all makes a directory.
If it already exists, no error is thrown.
Important to check for errors; if directory creation fails, stop further work.

Writing Data Inside the Directory

let file_path = "my_app_data/data.txt";
fs::write(file_path, "some important data")

Creates a new file inside the directory.
Saves "some important data" into it.

Listing Directory Contents

fs::read_dir(dir_path)

Reads entries inside the directory.
Must handle each entry carefully, since errors can happen while reading.
entry.path().display() shows the file or folder path in a readable format.

Key Takeaways

Always check results with match or if let to avoid crashes.
Writing overwrites files; be careful not to lose old data.
Directories may already exist, so handle that case smoothly.
Reading directories is useful to confirm what files you have created.