let db = new zango.Db('mydb', { people: ['age'] }); let people = db.collection('people'); let docs = [ { name: 'Frank', age: 20 }, { name: 'Thomas', age: 33 }, { name: 'Todd', age: 33 }, { name: 'John', age: 28 }, { name: 'Peter', age: 33 }, { name: 'George', age: 28 } ]; people.insert(docs).then(() => { return people.find({ name: { $ne: 'John' }, age: { $gt: 20 } }).group({ _id: { age: '$age' },

