Great job on the project. Couple of things to note are that since arrays are 0 indexed, for Challenge#1 in arrays.js, car with id =33 is inventory[32]. For challenge#2, you could use a for loop and push the car models to a new array, which you could apply the array sort method. For Challenge#3 in objects.js, since you created an array of objects, you could add the speak method to the the interns array, i.e. interns.speak = function () {...

Regarding you challenge#2 notes. wouldn't the way i did it be the simpler and/or more efficient way to do it though?