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QAn altered component may be uniquely identified with the help of ref.

ID: #4343 ReactJS - Keys and Ref 512 views
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Batching of multiple setState() calls in a single update is possible. To Prevent firing of the component's lifecycle methods you can use null from render method. If you create an element, you cannot change its ________. Ref is used to refer an/a element/component returned by _______________. We can go for ________ when there is a possibility that our user could change the data. If our elements are dynamic, React can keep track of the changes using keys. Which lifecycle event is invoked before rendering and when new props or state is being received? Keys used within arrays should be globally unique.