1. What is a closure? 2. In a garbage-collected language like JavaScript, how are memory leaks possible? Describe the low-level mechanics of a memory leak. 3. What would be the challenges in implementing a dead code elimination tool that targets JavaScript, as opposed to one that targets a language like C# or Java? 4. JavaScript performance has improved significantly over the past 10, 5 years, and is continuing to do so. What are some of the implementation techniques that have enabled this? 5. New JavaScript language features have been added over the past 10, 5 years, too. Is it possible that new language features can actually improve the performance of applications? Or, would you expect new language features, in general, to have either zero or negative effect on performance? Why or why not?
