Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial


Berry Loeffen
Berry Loeffen
4,303 Points

Why assigning a constant for instance Point?

Hi there,

When i type in the following:

Point(x: 2, y: 2).surroundingPoints(), this gives the same outcome as:

let coordinatePoint = Point(x: 2, y: 2) and then coordinatePoint.surroundingPoints()

I don't understand what the reason is for declaring the constant coordinatePoint first, since it gives the same answer. Can anyone explain?


Jose Patarroyo
Jose Patarroyo
2,953 Points

Hello Berry,

I don't remember why did Passan used the coordinatePoint constant in the video, but the basic difference in the code you wrote is: even though you will get the same answer on both of your examples, in the last one, you are storing the surrounding points in a constant called coordinatePoint which you can use later to perform another calculation. The code on your first example will show you the same answer, but the data is not stored hence, if you need it later in the code, you will have to calculate the surrounding points again and again and again...I think you know where I'm getting at.

So, if you need the data to perform further calculations, you may as well stored it in a constant or variable; if you only need it once, the first line of code you wrote will suffice.

1 Answer

Berry Loeffen
Berry Loeffen
4,303 Points

That makes things clear! thank you