Custom readable stream with node js

custom-readable-stream.js

/* Implementation */
var stream = require('stream');

// Create the custom stream
function Num(options) { 
    // Inherit properties
    stream.Readable.call(this, options);

    this._start = 0;
    this._end = 100;
    this._curr = this._start;
}

//Inherit prototype
Num.prototype = Object.create(stream.Readable.prototype);
Num.prototype.constructor = stream.Readable;

//Add my own implementation of read method
Num.prototype._read = function() {
    var num = this._curr;
    var buf = new Buffer(num.toString(), 'utf-8');
    
    this.push(buf);
    this._curr++;

    if (num === this._end) {
        this.push(null);
    }
};


//Usage
var num = new Num();

//Listening to data event (will be executed any time that get a piece of data)
num.on('data', function(chunk) {
    console.log(chunk.toString('utf-8'));
});