The reason is because you only set up your array to hold 3 items. When you typed a 3 instead of a 2 you were trying to access item number 4 (0 to 3, remember). But you haven't defined a fourth item. Even though you haven't got a fourth item, Javascript doesn't throw you up an error, it doesn't refuse to work.
Refactoring. Refactoring is the process of clarifying and simplifying the design of existing code, without changing its behavior.Agile teams are maintaining and extending their code a lot from iteration to iteration, and without continuous refactoring, this is hard to do. This is because un-refactored code tends to rot.efactoring is the process of clarifying and simplifying the design of existing code, without changing its behavior. Agile teams are maintaining and extending their code a lot from iteration to iteration, and without continuous refactoring, this is hard to do.
What is Remanufacturing? To define remanufacturing simply, it is the process of taking apart a no longer functioning product and re-building and refurbishing it to be usable again. Not to be confused with recycling, remanufacturing is much more involved than simply recycling a part. There are all kinds of products that can be remanufactured from heavy duty machinery parts, bridge components, automobile parts and pieces, steel panels, and electrical components.