ES6 Lexical this Example

gistfile1.js

function Gamer() {
	// 'this' refers to Gamer
	this.playTime = 0;
	
	// We use an ES6 arrow function
	setInterval(() => {
		// So 'this' still refers to the Gamer object
		this.playTime++;
		// Correctly outputs and incremented value representing play time in seconds
		console.log( this.playTime ); 
	}, 1000 );
}
 
var gamer = new Gamer();