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program is not a set of statements, we can't apply set properties on it, shouldn't it be a collection of statements ?
If we apply set properties on a program, program flow will get changed and it will not work as it is supposed to !!
Just in case this helps anyone else, I suspect the OP may have moved on by now, but... I'm guessing the OP may be ESOL? Or at least not accustomed to standard American usage. Yes, a mathematical set is a defined collection of distinct objects in which order is irrelevant. This is not referring to a program in terms of being a mathematical set, so the requirements, such as the order, and the operations you can perform on it aren't applicable. "Set" can be a simpler synonym for "collection", and generally can't be assumed to mean a set in the math sense when you're talking about it outside that context. A program's statements are definitely ordered, but they're still a set, they're just not that kind of set.
Jonathan GrieveTreehouse Moderator 90,689 Points
The default flow for any JS program is top to bottom. Unless you use things like functions, while loops and condition statements, the program will always just run one statement after the other from top to bottom. The only way you can change this is if you run certain actions based the value of a variable or an input prompt.
Sorry if all this sounds confusing. Just for now know that JS programs always run from top the bottom of your scripts.