jsConversation

//COMPILER: Scope, can you register an `Animal` and a `dog`?
//SCOPE: Sure.
var Animal, dog;

//ENGINE: Scope, do you have `Animal` available?
//SCOPE: Sure, here it is.
//ENGINE: I'm assigning a reference to the anonymous function to `Animal`

//COMPILER: I see a function expression with a parameter called `inLove`
//COMPILER: Scope, can you register `inLove` inside this function scope?
//SCOPE: Sure.

Animal = function(inLove) {

//ENGINE: Scope, do you have a `inLove` variable?
//SCOPE: Sure do, here ya go.
//ENGINE: great, looks like its value was set to `true` when this function was
//        called.
//ENGINE: looking up what `this` was bound to when this function was called.
//ENGINE: ahh, it's this empty object. I'm adding the `lovesHumans` property to
//        it, and setting the property value to `true`.

    this.lovesHumans = inLove || false;
    
//ENGINE: since there's no other explicit `return ..` here, I'm returning back the
//        `this` from this function call, like an assumed `return this;`
};

//ENGINE: Scope, do you have an `Animal` variable?
//SCOPE: As usual, yes. Here.
//ENGINE: great, looks like Animal points to that function.

//ENGINE: calling the function with `new`, which means I need to create an empty
//        object for its `this` to point to. Also, passing `true` for the first
//        argument, whatever it's called.
dog = new Animal(true);

//ENGINE: great, got an object back from that `Animal(..)` function call.
//ENGINE: Scope, do you have a `dog` variable?
//SCOPE: Sure do, here ya go.
//ENGINE: great, assigning its reference to the `dog` variable

//ENGINE: looking at the `dog` object, does it have a `lovesHumans` property?
//        yep, and its value is currently `true`.
dog.lovesHumans; // true