In JavaScript, functions cannot directly return multiple values. To achieve this, you can return an array or an object containing the values. Returning an object allows for more readable and maintainable code by assigning names to each value. The ES6 syntax { firstName, lastName } simplifies this by directly returning the values as an object with named properties. In React's useState, this approach is useful when returning multiple pieces of state from a custom hook, making the returned state properties easily accessible via object destructuring.
Read more at Returning Multiple Values from a Function (javascripttutorial.net)
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