Prototypes, usage in games

Hello all,

Been looking around at game tutorials and stuff and found the word prototype been thrown around alot.
Now how I understand it is that if your going to be creating two or more objects, that are of the same class, you should have some prototype statments.
Are these like constructors? Where should they go?

If i’m building a pong game, with blocks being created with an array, at the moment, right after there duplicated, I have parameters assigned to them eg breakable, hitpoints.

Would it be faster having prototype statments, and again, where do they go? Up to the top with all the other variables declars?

Cheers.