The delete operator deletes both the value of the property and the property itself. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. While looping, search for a marker with a custom attribute, in my case a 'key', added when the marker was added to the layer group. If you don't specify a value with a delete operation, all values of the given attribute will be deleted. Figure 1: List products by adding rows to a table when the page loads. Using the closest() method we select the current row ie closest tr of our delete button, and then with the remove() method will delete that record.. delete() Removes a Map element specified by a key: has() Returns true if a key exists in a Map: forEach() Invokes a callback for each key/value pair in a Map: entries() Returns an iterator object with the [key, value] pairs in a Map: keys() Returns an iterator object with the keys in a Map: values() Returns an iterator object of the values in a Map The jQuery add() method adds existing DOM elements to an existing jQuery object. At the bottom of this HTML page, I created a