[ITEM 1] QUESTION: Как удалить элемент? ===ANSWERS=== QUESTION: How to remove an element?

Managing the lifecycle of elements on a web page involves not only creating them, but also correctly removing them when they are no longer needed by the user. In modern JavaScript, there are several effective ways to remove elements from the DOM tree, each with its own application features. The simplest, most concise, and modern way is the el.remove() method, which is called directly on the element being removed. This approach is supported by all modern browsers and does not require accessing the parent container, making the code cleaner and more readable.

Historically, another approach exists that is often found in older codebases: the parent.removeChild(el) method. To use it, you must first find the parent element of the node to be removed, and then pass the node itself as an argument. Although this method requires more lines of code compared to remove(), it can be useful in specific optimization scenarios or when strict hierarchy control is required.

Sometimes, instead of completely removing an element, you need to replace it with another one. The el.replaceWith(newEl) method is great for this purpose, automatically replacing the current element with a new node or a set of nodes passed in the arguments. If the task is to quickly clear a large container of all child elements, developers often use the trick of resetting the parent element's innerHTML property to an empty string, for example, innerHTML = ''. This method works very quickly, although it has nuances related to memory leaks in some browsers due to event listeners not being properly removed.

It is important to note that removing an element from the DOM using the listed methods does not completely destroy its object in RAM if variables in the JavaScript code continue to reference it. Due to this, removed elements can be inserted back into the document in a different place using standard insertion methods, while preserving their state, attached data, and nested structure.