DAY 6

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 three tutorials to work through, plus a summary and a checkpoint. Once you’ve completed each video you can read the optional extra section, and there’s a short test to help make sure you’ve understood what was taught.

1. How to use a for loop to repeat work
   • Optional: Why does Swift use underscores with loops?
   • Optional: Why does Swift have two range operators?
   • Test: For loops
2. How to use a while loop to repeat work
   • Optional: When should you use a while loop?
   • Test: While loops
3. How to skip loop items with break and continue
   • Optional: Why would you want to exit a loop?
   • Optional: When to use break and when to use continue
   • Test: Exiting loops
4. Summary: Conditions and loops
5. Checkpoint 3

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