Prototype Question

[Max Nathaniel Ho]

Hi all,

Once again, thank you to the staff at Harvard CS Department for this enriching course. 

I was watching JavaScript, Part 1, and I found certain parts difficult to comprehend, especially the parts regarding the Prototype methods.

I reference this code - http://cdn.cs164.net/2014/spring/talks/javascript-1/src/example2.js

I have one main question. 

var CS = function() { Course.apply(this, arguments); }; 
// Create a temporary object so we can get an instance // of the course and 

var temp = function() {} 
temp.prototype = Course.prototype; 

// The CS "prototype chain" now has an 
CS.prototype = new temp(); 
CS.prototype.department = 'Computer Science';

Based on the above lines of code, what is the reason for creating a new temp.prototype object and assigning it to CS.prototype versus simply creating a new course.prototype object and assigning it to CS.prototype, since both we are inheriting the prototypes from the Course object. 

Sorry but Tim's explanation wasn't clear.

Thank you.