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

iOS Build a Simple iPhone App (iOS7) Refactoring into a Model Readonly Attribute

Posted by Pierre-Emmanuel Turcotte
Pierre-Emmanuel Turcotte
13,670 Points

Isn't it considered "implementing" when declaring the *_predictions variable inside the header file?

I do not get why we should declare the variable in the header file? I tested declaring it inside the implementation file and it works fine? Is it best practice?

I just feel thrown off when seeing the declaration and the curly braces in the header file...

1 Answer

Stone Preston
Stone Preston
42,016 Points
Stone Preston
Stone Preston
42,016 Points

declaring variables in the header file lets them be seen and accessed by other classes (similar to a public variable in some languages, though not exactly). if you declare it in the implementation the variable can only be accessed within that class (similar to being private

you probably want it in the header because you will be accessing it from a different class