Question

How to associate an object to a key on a node?

(a) getUserData()

(b) cloneNode()

(c) setUserData(key,data,handler)

(d) clonedata()

This question was addressed to me in an interview for job.

I need to ask this question from Node Operations in JavaScript topic in section Document Object Model and Event Handling in Javascript of JavaScript

Answer 1

The correct answer is (c) setUserData(key,data,handler)

Best explanation: The Node.setUserData() method allows a user to attach (or remove) data to an element, without needing to modify the DOM. This method is used to associate an object to a key on a node.