HSL ~2022.2 %hw3
Homework #3 for Hoon School Live.

With the introduction of cores, you are now equipped to build Hoon generators that can also function as libraries.

You have learned about the following runes:

- `|-` barhep, for producing a trap (like a loop or repetition label)
- `.+` dotlus, for increasing a value by one
- `.=`, for checking equality/equivalence of two values
- `%=` centis, for "rebooting" the current code with new values
- `|%` barcen, for collecting many functions and values in one core
- `++` luslus (actually a digraph, not a rune, but that's technical), for labeling a gate
- `+$` lusbuc (ditto), for labeling a type
- `=<` tisgar, for
- `=>` tisgal, for
- `~&` sigpam, for output as a debugging or messaging tool
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Q0. What is your planet or comet? (Type "our" in the Dojo of your ship to identify if you're not sure—your ship, not your fakeship.) *
Q1. You work in a lab. The lab uses a scale which is inaccurate for values less than 10 grams. Any weight less than that should simply register as zero in your measurements. Write a gate in an arm `++corrected-weight` which checks whether the value is less than 10 and returns zero if it is, otherwise returns the normal value. (Just answer with the arm; don't worry about the core for this question.) *
Q2. The lab needs to know the total quantity of reagent (in grams) you've been able to produce in the past week. Each day's total may be calculated by taking the day number times itself. (E.g. on day three 3×3=9 grams were produced. The reaction is reset every Monday.) Write a trap to add up the seven values. *
Q3. FizzBuzz is a classic computer science challenge question. For this step, write a gate in an arm `++fizz` which accepts a count and counts upward, outputting (using ~& sigpam) the number each time and `"fizz"` every third number until the count is reached. (I.e., given 7, it should count from 1 to 7 and output "fizz" at 3 and 6.) *
Q4. For this step, write a gate in an arm `++buzz` which accepts a count and counts upward, outputting (using ~& sigpam) the number each time and `"buzz"` every fifth number until the count is reached. (I.e., given 7, it should count from 1 to 7 and output "buzz" at 5.) *
Q5. For this step, write a gate in an arm `++fizzbuzz` which accepts a count and counts upward, outputting (using ~& sigpam) the number each time, `"fizz"` every third number, and `"buzz"` every fifth number until the count is reached. (I.e., given 15, it should count from 1 to 15 with the output: 1 2 3 fizz 4 5 buzz 6 fizz 7 8 9 fizz 10 buzz 11 12 fizz 13 14 15 fizz buzz, but with line breaks between them.) Make sure that it outputs *both* "fizz" and "buzz" for numbers that are divisible by both three and five. *
Q6. Produce a type arm named `reptile` using +$ lusbuc which is a type union ($? bucwut) for several reptiles of your choice. (E.g. if I were doing this for amphibians, I could use %frog, %toad, and %salamander.) Provide at least four options in the type union. (The `%word` syntax is a "term", or internal constant value we can use to label things in Hoon: previewing this a bit!) *
Q7. Recall the calculator problem from %hw2. Convert it to use a |% barcen core for the operations (e.g. `++add-num`) with either a `=<` tisgal or `=>` tisgar. Produce a generator which accepts two numbers and an operation, such as `+calc [5 4 %mul]` and yields `20`. *
Q8. What are your biggest remaining concerns, points of misunderstanding or fuzzy understanding, or other feedback on Lesson 3?
A copy of your responses will be emailed to the address you provided.
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