/* 1. Query Operators */ db.posts.find({ viewsCount: {$get: 1000, $lte: 3000} }, {_id: 0, viewsCount: 1, title: 1}) // $in db.posts.find({ categories: {$in: ['ios']} }, {categories: 1}) //$where db.posts.find({ $where: function(){ return this.categor…