some sample mongodb/mongoose queries

queries.js

//given this schema ... 
// {
// 	[id]
// 	name: String,
// 	email: String,
// 	bio: String,
// 	createdAt: Date,
// 	age: 11
// }

//order these queries from least efficient to most efficient

User.findOne({createdAt: {'$gt': new Date(2015, 02, 12)}}).exec();

User.findOne({_id: 'aasldkjflkj324'}).exec();

User.find({name: function(name) { return name.charAt(0) === 'F'; }}).exec();

User.findOne({bio: new RegExp('some phrase', 'g').exec();

User.findOne({name: new RegExp('^F'}).exec();

User.findOne({age: 12}).exec();

User.findOne({name: function(name) { return name.charAt(0) === 'F'; }}).exec();