如何为特定的javascript对象扩展数组或对象原型？

Question

Say I have the following:

function Myobj = {
   name: "Julia",
   birthdate: "xxxx",
   genres: [],
   movies: [{title: "movie1", rating: 5, genre: "Horror"}, {title: "movie2", rating 3, genre: "Comedy"},{title: "movie3", rating 3, genre: "Comedy"}, {title: "movie4", rating 3, genre: "Comedy"}, {title: "movie5", rating 3, genre: "Horror"}]
}

What I want to be able to do is have some function like:

Myobj.prototype.pushMovie(somejson) {
   // code to add somejson to "movies", and add the "genre" to the "genres" array
}

Such that I can go:

obj1 = new Myobj();
obj1.pushMovie({title: "movie1", rating: 5, genre: "Horror"});

Or is it better practice to override the array prototype? If so, is it possible to give a prototype a specific array as opposed to all arrays like:

Myobj.Array.prototype.pushMovie() {
// code to inherit from regular push, and do some operation to add to "genres"
}

I do not know what the syntactically correct or best approach is.

Answer 1

Why not this?

Myobj.prototype.addMovie(somejson) {
   this.movies.push( somejson );
}
Myobj.prototype.addGenre(somejson) {
   this.genres.push( somejson );
}
Myobj.prototype.pushMovie = Myobj.prototype.addMovie;