// use strict mode at the first of javascript file this is usefull to write 
    javascript code and sequer-ly.
    
// strict mode makes it easier for devolope to avoid accsidently errore's.
// it helps us intridues the buginto our code

// 1. First, strict mode forbids us to do certain things
// 2. econd, it will actually create visible errors for us in certain
    situations
    in which without strict mode JavaScript will simply fail silently
    without letting us know that we did a mistake.