Salesforce JavaScript Developer Practice Exam

How long does sessionStorage data persist?

1. Forever, the data doesn't get lost.

2. When the user closes the tab.

3. When the user closes the entire browser.

4. When the user shuts off their computer.

The correct answer is: When the user closes the tab.

Session storage is designed for temporary data storage per session within the web browser. It specifically holds data until the browser tab is closed. This means that any data stored in session storage will be cleared once the tab that stored it is closed. This behavior is useful for storing information that should only be available within the context of a single page session, such as input data or state management for a web application during a user's interaction with the page. The option indicating that the data persists "when the user closes the entire browser" does not account for the specific behavior of session storage, which is limited to individual tabs. Likewise, stating that it lasts "forever" contradicts the very purpose of session storage, which is inherently temporary. Finally, asserting that the data persists "when the user shuts off their computer" also misrepresents session storage's temporary nature, as shutting down would result in the loss of all session identifiers and their associated data. Thus, session storage is effective for managing data that needs to be retained only for as long as the tab remains open, making the option indicating persistence until the user closes the tab the most accurate.