add scale-generator exercise

[seeksort]

Adding scale-generator exercise. Closes #751.

One thing I'm not sure about is updating config.json. I just based it on the same entry in other tracks, not sure if there's other stuff I should consider.

[SleeplessByte]

Sweet. We'll review this. You did great with the config.

• Is this a new UUID?
• We need to decide which exercise in the core unlocks this exercise
• Are those topics correct with this exercise?

[seeksort]

Yup, I used a uuidgen. And the topics are covered by the exercise; I can add more if you think there are other relevant topics!

How do we determine the unlock exercise? Is it intended to be the same for all tracks or does it depend on the track? The Python version uses kindergarden-garten as the unlock exercise, but when I tried to do that I got an error about using a non-core exercise to unlock another non-core exercise.

[SleeplessByte]

Good question!

Each track has its own core. You can see it here for JavaScript, in bold. Each side exercise is unlocked by a core exercise. Since tracks are not the same across languages, neither are the unlocks. Usually I do the following:

• Is it related to a core exercise, probably there (re: ciphers)
• Otherwise, is there a core exercise without anything? Re-assign things so each core exercise has some (not the case now)
• Otherwise, use binomial on the difficulty. So in this case, it should be tied to a core exercise with 2-4 difficulty, or can be added to an earlier one if there's not a lot of 3s yet.

If we look at the Python track, we can see that kindergarten is mid of the second-third of the core exercises, which I think is late. I think unlocked_by: pangram is a good candidate!

[seeksort]

Thanks for the guidance @SleeplessByte ! Looking at pangram, I agree it's a good candidate for unlocking this one, since it looks like there are similar matching and arrays elements. I'll push up an update for config.json.

[SleeplessByte]

Let's do this!

[SleeplessByte]

@seeksort if you have 5 more minutes, would you be so kind and see if you can help us out by responding to this issue?

Awesome work on this. Let's see how this propagates :)

[SleeplessByte]

Woot! 🎉

[seeksort]

Yay! And it deployed so quickly!

Sure, I'll check it out. Thanks again for your help!