Chapter 9. Page 332.
when you don’t care about about the concrete
Should be:
when you don’t care about the concrete
Thank you for catching that! As many times as I reread a chapter, I still miss typos like this. I’ve updated the Dart Apprentice editions/1.1 repository branch and also the newly published Dart Apprentice: Beyond the Basics editions/1.0 branch with the correction. So for those reading the online version, the changes should be reflected there soon.
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