animate_without_closure.js

animate() {
  let delaySoFar = 0;
  
  for (let sequence of this.dataSet) {
    let delay = sequence[0] + delaySoFar;
    let objects = sequence.filter(this.isObject);
    let styles = this.formatStyles(objects);  

    setTimeout(() => {
      this.element.style = styles;
    }, delay);

    delaySoFar = delay;
  }
  styles;
}