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Code review: JavaScript constructors and prototpyes

// here i'm creating a new constructor for a user object
function User(first_name, last_name, email, password, friends, favorites) {
    this.first_name = first_name;
    this.last_name = last_name;
    this.email = email;
    this.password = password;
    this.friends = [];
    this.favorites = [];

// this function adds a new friend to the friends array
User.prototype.add_friend = function(friend) {

// this function deletes a friend from the friends array 
User.prototype.delete_friend = function(friend) {
    this.friends.splice(this.friends.indexOf(friend), 1);

// this function adds a favorite to the favorites array
User.prototype.add_favorite = function(favorite) {

// this function deletes a favorite from the favorites array
User.prototype.delete_favorite = function(favorite) {
    this.favorites.splice(this.favorites.indexOf(favorite), 1);

var user = new User("Andrew", "Chalkley", "andrew@teamtreehouse.com", "secretpassword");

I'm mainly concerned about the 'delete' functions that are supposed to splice a friend or favorite from it's array.