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.
Refacing is a word that is interchangeable with the term resurfacing, especially when it comes to cabinet makers and professional remodelers. It simply means that the face, meaning the front or visible surfaces are getting a facelift. So in essence, they mean the same thing. Refinishing. The difference to note is the difference between refacing cabinets and refinishing cabinets.