I don't understand this part: var result = dice.roll();

I haven't been following the series, but I'm pretty sure I can guess what's tripping you up. It's a lot deeper than you might expect, but if you can master this it'll take you far! Consider the following:

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// In the following code, we ask for the value of bar. You get an error: "Bar wasn't DEFINED". One of the bad parts of js is that in this case it SHOULD say "not DECLARED", but doesn't. It says "not DEFINED".

bar

---

// Here we DECLARE bar without DEFINING it.

var bar

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// Here we ask for the VALUE of bar again. It's undefined but not an error, because it was already DECLARED

bar

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// Here we DECLARE foo, and DEFINE it by ASSIGNING it to a VALUE

var foo = "hello"

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// Here we ask for the VALUE of foo, and get back the string "hello"

foo

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// Here we're trying to DECLARE two different variables. That doesn't make sense, and will error

var arr = var foo

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// Here we DECLARE arr and DEFINE it by ASSIGNING it to the VALUE of foo, which is the string "hello"

var arr = foo

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// Therefore, asking for the value of arr will return the string "hello"

arr

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Now your question was similar, just with objects and functions. Side note on semantics: a method is just a function attached to an object. Note that calling a function or method by it's name will return the function itself. Calling it with parenthesis attached will give the RETURN VALUE of the function.

// Let's define the object dice

dice = {

roll: function() { return 42; }

}

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// Here we ask for the OBJECT dice. It is { roll: function(){ return 42; } }

dice

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// Here we ask for the RETURN VALUE of the method roll. It is 42.

dice.roll()

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// Here we ask for the method itself. It is function() { return 42; }

dice.roll

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//Now finally your answer should be clearer. The following gives an error, you're trying to declare two things at once

var result = var dice

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// Below, result is assigned to the object itself.

var result = dice

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// below, we ask for the value of result, which is an object. { roll: function(){ return 42; } }

result

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// Next, result is reassigned to the method itself.

var result = dice.roll

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// We call it, get back the value, which is a function. function(){ return 42; }

result

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// Finally, result is reassigned to the RETURN VALUE of the method.

var result = dice.roll()

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// we call result, and get back the number 42.

result

"dice" is a object. "roll()" is a function of the object (a method). So, "dice.roll()" will give you a number automatically.