Create a Readable Stream implementation that generates random strings

creatingReadableStream.js

const stream = require('stream');
const Chance = require('chance');
const chance = new Chance();

class RandomStream extends stream.Readable {
  constructor(options) {
    super(options);
  }

  _read(size) {
    const chunk = chance.string();                          // [1]
    console.log(`Pushing chunk of size: ${chunk.length}`);
    this.push(chunk, 'utf8');                               // [2]
    if(chance.bool({ likelihood: 5 })) {                    // [3]
      this.push(null);
    }
  }
}

// [1] Generates a random string using chance lib
// [2] Pushes the string into the internal reading buffer. Since we are
//     pushing String, the encoding is specified
// [3] The bool method returns true at a 5% likelihood. In this case, null
//     is pushed into internal buffer which triggers the 'end' event


// Usage of RandomStream
const randomStream = new RandomStream();

randomStream
  .on('readable', () => {
    let chunk;
    while((chunk = randomStream.read()) !== null) {
      console.log(`Chunk received: ${chunk.toString()}`);
    }
  })
  .on('end', () => console.log('End of stream'));