What is 'final' keyword for?

Hello, everybody!
In HasDataPresenter.java I see code like this:

// Update the page size.
final boolean pageSizeChanged = (pageSize != length);
if (pageSizeChanged) {
pageSize = length;
}

and later
if(pageSizeChanged)
doSomething();

What a reason to use 'final' keyword here? Dos it help to produce
better java script?

Thank you,
Andrey

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