Execution context in JavaScript

Question

I have an object named Gallery with several properties and methods. One of them, setCurrentPicture, removes all existing photos and videos DOM elements from gallery container b

Answer 1

I should add bind this to Array.prototype.forEach.call instead of implementing this to callback function.

 Array.prototype.forEach.call(container.children, function(item) {
          if (item.tagName === 'VIDEO') {
            document.removeEventListener('click', this.togglePlayVideo);
          }
          if (item.tagName === 'VIDEO' || item.tagName === 'IMG') {
            container.removeChild(item);
          }
        }.bind(this));

Thanks to all for the answers.