Data after transformation must be a string, an arraybuffer, a buffer, or a stream

When working with data transformations in JavaScript, it is important to keep in mind that the transformed data must be in one of the following formats: a string, an ArrayBuffer, a Buffer, or a stream. These formats are commonly used to handle different types of data, and each one has its own specific use cases.

1. String: This format is the most basic and widely used for representing text data. It is a sequence of characters enclosed in single quotes (”) or double quotes (“”). For example:

    const transformedData = 'This is a string.';
  

2. ArrayBuffer: This format is typically used when working with binary data or data that needs low-level memory manipulation. It represents a fixed-length raw binary data buffer. Here’s an example:

    const dataView = new DataView(new ArrayBuffer(4));
    dataView.setInt32(0, 42);
    const transformedData = dataView.buffer;
  

3. Buffer: This format is commonly used in Node.js and provides a way to handle binary data efficiently. It is equivalent to an ArrayBuffer, but with additional utility methods. Here’s an example:

    const buffer = Buffer.from('Hello, world!', 'utf8');
    const transformedData = buffer;
  

4. Stream: This format is used for handling continuous data streams, such as reading files or network sockets. It allows for reading data or writing data in a sequential manner. Here’s a simple example using the Node.js ‘fs’ module to create a readable stream from a file:

    const fs = require('fs');
    const readableStream = fs.createReadStream('example.txt');
    // You can then further process the stream as needed