example.js

User.all({
  success: function(users){
    $.each(users, function(index, user) {
      console.log("all: here I am, user " + user.email + " (id:" + user.id + ")");
    });
  }
});

User.find(1, {
  success: function(user) {
    console.log("find: here I am, user " + user.email + " (id:" + user.id + ")"); 
  }
});

Console output:

all: here I am, user undefined (id:undefined)
example.js:11find: here I am, user [email protected] (id:1)