Are prototypes bad in JavaScript?

Question

In Felix\'s Node.js Style Guide it says:

Do not extend the prototypes of any objects, especially native ones. There is a special place in hell waiting

Answer 1

Do not extend the prototypes of any objects, especially native ones.

When you extend native objects, like for example string that could be a problem because users are expecting some behavior from that object, but are getting different results. They could get a hard time debugging this..