Data Hacks: Using the FS Promise Module

Introduction

• Presenter: Welcome to Data Hacks.
• Topic: Explanation on using the FS Promise module.
• Previous Video: Covered FS module. Link provided in the top right corner for reference.

Setting Up

• Comment All Codes: Initially, comment all the codes.
• Create Constant:

  const fs = require('node:fs').promises;
  

Reading Files Asynchronously

• Constant File Content:

  const fileContent = fs.readFile('path_to_file', 'utf-8');
  

• Using .then and .catch:
  • Don't need to create a variable.
  • Use Arrow functions:

    .then(data => console.log(data))
    .catch(error => console.error(error));
    

Running Code

• Format Document: Always format your document.
• Open Terminal and Run:

  node index
  

• Expected Outcome: The value should display correctly (e.g., 'hello data hacks').

Proving Asynchronous Operation

• Initial and Final Values:
  • Show console outputs at initial and final stages.
  • Clear terminal and run to see the asynchronous behavior.

Using Async/Await

• Comment Out Previous Code: Comment out the previous method.
• Create Async Function:

  async function readFile() {
    try {
      const data = await fs.readFile('path_to_file', 'utf-8');
      console.log(data);
    } catch (error) {
      console.error(error);
    }
  }
  readFile();
  

• Format Document: Format the document again.
• Clear Terminal and Run:
  • Ensure the function is called.
  • Run the code and check output.

Conclusion

• Benefits: Using async functions makes the code more readable.
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