DAY 4

Loops

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Loops are one of the things that make computers so utterly brilliant: the ability to repeat some simple task billions of times every second.

Of course, what goes in those loops is down to you: you might be adding some numbers, you might be reading some sensor data, or you might be redrawing the screen 120 times a second. As Craig Bruce said, “it’s hardware that makes a machine fast, but it’s software that makes a fast machine slow.”

Today you have eight one-minute videos to watch, and you’ll meet things like for loops, infinite loops, and more. Once you’ve watched each video and gone through any optional extra reading that interested you, there’s a short test to help make sure you’ve understood what was taught.

1. For loops
   • Optional: Why does Swift use underscores with loops?
   • Test: For loops
2. While loops
   • Optional: When should you use a while loop?
   • Test: While loops
3. Repeat loops
   • Optional: When should you use a repeat loop?
   • Test: Repeat loops
4. Exiting loops
   • Optional: Why would you want to exit a loop?
   • Test: Exiting loops
5. Exiting multiple loops
   • Optional: Why does Swift have labeled statements?
   • Test: Exiting multiple loops
6. Skipping items
   • Optional: When to use break and when to use continue
   • Test: Skipping items
7. Infinite loops
   • Optional: Why would you want to make an infinite loop?
   • Test: Infinite loops
8. Looping summary
   • Test: Looping

Need help? Tweet me @twostraws!

 

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