Which of these prototype declarations is better and why? [duplicate]

Question

I'm trying to decide how to set up my functions in the prototype for my main library.

Should I use:

Library.prototype.funcA = function () {.....};
Library.prototype.fucnB = function () {.....};
etc..

or

Library.prototype = {
    funcA: function () {.....},
    funcB: function () {.....},
    etc..
};

So basically the first choice adds all my functions to the prototype. The second option replaces the prototype with an object containing all my functions. Does it matter?

Answer 1

I would go with the first option.

You don't want to completely replace the prototype, as you never know what has been added from another project.

If it's something completely self-contained that only you are working on, the second is an ok option. But it is still not a good habit to get into so you don't inadvertently blow away some functionality something else is counting on.