class Listener {

   constructor(element) {

      this.isLastExecution = false;

      this.element = element;

   }

​

   addClickListener() {

      this.element.addEventListener('click', this);

   }

​

   removeClickListener() {

      this.element.removeEventListener('click', this);

   }

​

   handleEvent(event) {

      console.log('Executed!');

      if (this.isLastExecution) {

         this.removeClickListener();

      }

   }

}

​

const clickButton = document.querySelector('.click-button');

const lastTimeCheckbox = document.querySelector('.last-time');

const myListener = new Listener(clickButton);

​

myListener.addClickListener();

lastTimeCheckbox.addEventListener('change', function() {

   myListener.isLastExecution = !myListener.isLastExecution;

   if (!myListener.isLastExecution) {

      myListener.addClickListener();

   }

});