How to prevent right-click on images

This is a very simple code by @rickymccallum87 from support. It is JavaScript. I installed the plugin Insert Headers and Footers by WPBeginner and put the following code into “Scripts in the footer”:

 * Prevents right click on images, by disabling contextmenu.
// Get all html elements with the tag 'img', i.e. all the images. The result is the array IMAGES of objects
var images = document.getElementsByTagName('img');
	//for all the images in the array
	for(var i = 0; i < images.length; i++) {
	/** If the context menu - by default activated by right-click - should be activated, 
	 * the default action is prevented
	 * */
		images[i].addEventListener('contextmenu', event => event.preventDefault());

Wondering what the event => event.preventDefault() means? It is an arrow function and it replaces an anonymus function and here is the step by step conversion, from the Mozilla’s site:

event => event.preventDefault()

Is the same as

(event) => event.preventDefault()

Which is the same as

(event) => {event.preventDefault()}

Which is the same as the anonymous function

     return event.preventDefault();

I applied it on the page of the photographer Lubka, on her wish.