Node.js Intermediate Level Code

If you are already familiar with the basics of Node.js, you may be interested in taking your skills to the next level. Here are some tips and examples of intermediate level Node.js code that can help you become a more proficient developer.

Use Promises and Async/Await

Node.js is designed to be asynchronous, which means that it can handle multiple requests at the same time. However, managing asynchronous code can be tricky. To make it easier, you can use Promises and Async/Await.

Promises are objects that represent a value that may not be available yet. They provide a way to handle asynchronous operations in a more organized and readable way. Async/Await is a syntax that allows you to write asynchronous code that looks and behaves like synchronous code.

Here is an example of how to use Promises and Async/Await in Node.js:

function readFilePromise(path) {
  return new Promise((resolve, reject) => {
    fs.readFile(path, 'utf8', (err, data) => {
      if (err) reject(err);
      else resolve(data);
    });
  });
}

async function main() {
  try {
    const data = await readFilePromise('/path/to/file.txt');
    console.log(data);
  } catch (err) {
    console.error(err);
  }
}

main();

Use Modules

Modules are a way to organize your code into separate files that can be reused and tested independently. Node.js comes with built-in support for modules, and it's easy to create your own modules.

Here is an example of how to create and use a module in Node.js:

// mymodule.js
module.exports = {
  add: (a, b) => a + b,
  subtract: (a, b) => a - b
};

// main.js
const myModule = require('./mymodule');
console.log(myModule.add(2, 3)); // Output: 5
console.log(myModule.subtract(5, 2)); // Output: 3

Use Streams

Streams are a way to handle large amounts of data in Node.js without loading it all into memory at once. They are particularly useful when dealing with files or network connections.

There are four types of streams in Node.js: Readable, Writable, Duplex, and Transform. Each type has its own set of events and methods.

Here is an example of how to use a Readable stream in Node.js:

const fs = require('fs');

const stream = fs.createReadStream('/path/to/file.txt', { highWaterMark: 1024 });

stream.on('data', (chunk) => {
  console.log(`Received ${chunk.length} bytes of data.`);
});

stream.on('end', () => {
  console.log('Finished reading file.');
});

Conclusion

These are just a few examples of intermediate level Node.js code. By using Promises and Async/Await, Modules, and Streams, you can create more efficient and organized code. Keep learning and experimenting to become a better Node.js developer.

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