Recursion is an age old concept used in mathematics when an object is defined by other objects of the same type. A real life example would be the mirrors in a department store dressing room. If you look in the right spot, you can see both reflections repeating themselves in each other. Each iteration of your image grows smaller and smaller into infinity. In computer science recursion happens when a solution to a problem is resolved by computing smaller instances of the same problem. In JavaScript,...