Example of "this" within event listeners

scope.js

// create EventEmitter instance
var myEventEmitter = new EventEmitter();

// attach a property
myEventEmitter.someVar = "some var";

// add event listener for "test"
myEventEmitter.on('test', function ()
    console.log(this.someVar);
});

// will output "some var"
myEventEmitter.emit('test');