DAY 74


In the last week your brain has been crammed full of important Swift and iOS skills. Don’t believe me? Here’s a list that’s not even complete: extensions, NotificationCenter, UITextView, color blending, shake gestures, for case let, reversing arrays, local notifications, and more – and that’s just in one week, while also building an app and a game!

Of course, just learning something new isn’t enough – it’s important to put that learning into practice, not only so that it really starts to stick in your head, but also so that you can take another step towards your goal of being an app developer. After all, it’s fun learning and I hope you’ll carry on discovering great new things in iOS and Swift for years to come, but I hope you have a greater goal in mind.

Henry Petroski, a professor of engineering at Duke University in the US, said “as engineers, we’re going to be in a position to change the world, not just study it.” Now that the end of the 100 days challenge is almost in sight, how do you plan to change the world?

Today you have three topics to work through, one of which of is your challenge.

Note: Don’t worry if you don’t complete challenges in the day they were assigned – in future days you’ll find you have some time to spare here and there, so challenges are something you can return back to in the future.

Need help? Tweet me @twostraws!


The 100 Days of Swift is a free collection of videos, tutorials, tests, and more to help you learn Swift faster. Click here to learn more, or watch the video below.

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