FAQ: Sets - .count and .isEmpty

Frequently Asked Questions Swift FAQ
1

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This community-built FAQ covers the “.count and .isEmpty” exercise from the lesson “Sets”.

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This exercise can be found in the following Codecademy content:

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FAQs on the exercise .count and .isEmpty

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2

Why is this not an acceptable answer?

if sockDrawer.isEmpty == true{

print(“Time to add some more socks!”)

}

the correct answer does not include the boolean check. I got the same result running the code either way. Thanks!

3

There is a formatting error in instructions (at at least as rendered in Safari 14.0.3). It looks like the following but without the backslash (which I needed to escape the backpacks)

 print the following message: ``` We have [X] pairs of socks.

\```

It appears that someone used three back ticks where just one backtick was intended.

4

It appears that Codecademy is insisting on things that Swift itself does not insist on. I have encountered this in other lessons.

This makes sense, as they are trying to teach particular idioms and habits. So when we hit those kinds of things we should just try to do it the way the teacher wants us to.

5

Old post, I know, but in case other people have the same question:

sockDrawer.isEmpty is already a boolean, so testing if it ==true is redundant and not necessary.

It’s a general idiom in most programming langauges - if you’re using a bool type property or function inside in if statement, it’s almost always preferable to write it as if(myBool) instead of if(myBool == true). It’s simpler and reads cleaner IMO.