Week 6 - Advanced topics

Synchronous File IO

File processing

Error handling

Array functions

Closures

Style - How to write meaningful comments

Practice

Assignment

Back to core program

Week 6 Overview

This week takes your JavaScript skills to the next level by tackling real-world programming challenges: working with files, handling errors gracefully, and mastering powerful array methods that professional developers use daily.

You'll learn to read and write files (whether plain text, CSV data, or JSON) giving your programs the ability to persist and process data beyond a single run. Error handling becomes crucial here: you'll learn to anticipate problems and write code that fails gracefully rather than crashes.

Array methods like map, filter, and reduce are game-changers. Instead of writing manual loops for common tasks, you'll use these elegant, expressive functions that make your code shorter and more readable. Closures unlock advanced patterns for encapsulating data and creating specialized functions.

Finally, you'll learn the art of writing meaningful comments: not just what your code does, but why it exists and what decisions you made.

Learning goals

• Read and write files synchronously using Node.js fs module
• Parse and process different file formats (TXT, CSV, JSON)
• Handle errors with try-catch blocks and throw custom errors
• Transform and filter data using array methods (map, filter, reduce, find, etc.)
• Understand closures and use them for data encapsulation
• Write clear, purposeful comments that explain intent, not implementation

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