javascript – Method, Functions and Objects

I have been doing code academy for the past few weeks and i am currently doing the object, function and method section on the Javascript Fundamentals (42%). I havent really skipped any bits as i really want to learn properly. However, i am having some problem understanding the use of functions, methods and objects.

I understand that an object is to store information such as real world info:

personObj=new Object();     
personObj.firstname=\"John\";
personObj.lastname=\"Doe\";
personObj.age=30;
personObj.eyecolor=\"blue\";

Also, what exactly are constructors? and what does .this mean?

I also learnt to create a function, the way is

var whatever = new Function(){
 then whatever here
}

but in code academy, they started coding with:

function whatever(){
Then Whatever
}

Whats the difference? I would love for someone to explain in the \”Javascript for Dummies\” type…

Thanks again!

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