Javascript binding using call with setInterval

You are .calling .setInterval not your callback function which the browser calls:

setInterval( this.tick.bind(this), 1000 );

Should work. See .bind

This is what I ended up with:

  var timer = {
    time: 0,
    start: function() {
      var timerTick = this.tick.bind(this);
      window.setInterval(function() {
        timerTick();
      }, 1000);
    },
    tick: function() {
      this.time += 1;
      console.log(this.time);
    }
  };

  timer.start();