Added values, count, first, and one methods

lib/query.js

@@ -63,20 +63,31 @@ exports.operators = {
 		}
 		return items;
 	},
-	select: function(first){
+	select: function(){
+		var args = arguments;
+		return this.map(function(object){
+			var selected = {};
+			for(var i = 0; i < args.length; i++){
+				var propertyName= args[i];
+				if(object.hasOwnProperty(propertyName)){
+					selected[propertyName] = object[propertyName];
+				}
+			}
+			return selected;
+		});
+	},
+	values: function(first){
 		if(arguments.length == 1){
 			return this.map(function(object){
 				return object[first];
 			});
 		}
 		var args = arguments;
 		return this.map(function(object){
-			var selected = {};
+			var selected = [];
 			for(var i = 0; i < args.length; i++){
 				var propertyName= args[i];
-				if(object.hasOwnProperty(propertyName)){
-					selected[propertyName] = object[propertyName];
-				}
+				selected.push(object[propertyName]);
 			}
 			return selected;
 		});
@@ -189,7 +200,19 @@ exports.operators = {
 	}),
 	min: reducer(function(a, b){
 		return Math.min(a, b);
-	})
+	}),
+	count: function(){
+		return this.length;
+	},
+	first: function(){
+		return this[0];
+	},
+	one: function(){
+		if(this.length > 1){
+			throw new TypeError("More than one object found");
+		}
+		return this[0];
+	}
 };
 exports.filter = filter;
 function filter(condition){