If you’re stuck, you may use ChatGPT to clarify the assignment — but not to solve it for you. To do this, copy the meta-prompt below into ChatGPT along with the assignment question.
You are acting as a tutor. Your job is to explain what this coding question is asking, clarify confusing wording, and highlight the relevant concepts students need to know — but do not provide the full solution or code that directly answers the question. Instead, focus on rephrasing the problem in simpler terms, identifying what’s being tested, and suggesting what steps or thought processes might help. Ask guiding questions to ensure the student is thinking critically. Do not write the final function, algorithm, or code implementation.
Be mindful of your AI usage on assignments. AI can be a great tool to help your learning but it can also be detrimental if you let it do too much of the thinking for you.
At Marcy, we will deem an assignment as "complete" if the solution passes at least 75% of the automated tests.
However, we know many of you will feel the urge to hold off on submitting until your assignment feels 100% perfect. That drive for excellence is an asset!
But perfectionism can also get in the way of learning — especially when we need to cover a lot in a short amount of time.
That’s why we encourage you to be comfortable with being “provisionally complete.” This means:
- Submitting your work even if it isn’t perfect yet
- Treating submission as a checkpoint, not a finish line
- Committing to return, revise, and improve later
Learning to move forward with provisional completeness will help you make steady progress while still building the habit of continuous improvement.
For guidance on setting up and submitting this assignment, refer to the Marcy lab School Docs How-To guide for Working with Short Response and Coding Assignments.
Here are some useful commands to remember.
npm i # install dependencies
git checkout -b draft # switch to the draft branch before starting
npm test # run the automated tests
npm run test:w # run the automated tests and rerun them each time you save a change
git add -A # add a changed file to the staging area
git commit -m 'message' # create a commit with the changes
git push # push the new commit to the remote repoSome functions in this assignment return values while others use console.log. Pay close attention to the instructions for each function to know which approach to use.
For functions that use console.log, our tests need to be a little more complicated. We'll need to mock the console.log function in order to spy on the arguments it's called with.
The other big thing this does is remove your console.log for the purpose of debugging. You can easily get around this by using console.info instead. (Did you know there are other log methods? Check out all the log options here)
Just be very careful about exactly what the test cases are expecting. Return values and outputs must be perfect! "hello there" and "Hello there!" are not equal.
Good luck!
Write a function measureRain that takes a single argument, a number inches. It should return a message depending on the number of inches:
- 0 inches -
'drought' - less than 2 inches -
'dry' - less than 4 inches -
'average' - less than 6 inches -
'rainy' - 6 or more inches -
'flood'
Write a function happyBirthdayPet that takes two arguments, a string breed and a number age. It should return a message in the following situations:
'snake', any age -'Hiss hiss!''cat', less than 5 -'Mew mew!''cat', 5 or more -'Meow meow!''dog', less than 5 -'Arf arf!''dog', 5 to less than 10 -'Woof woof!''dog', 10 or more -'Boof!'- If none of these conditions are met, just return a message of
'Happy birthday!'
Write a function funTypes that takes an argument jsType. The type could be one of the following: a string, a number, a boolean, undefined, null, an object, an array, or NaN.
It should return a message in the following situations:
- any string -
"That's just some text." - any number -
"That's a good number." - a boolean -
"To bool, or not to bool?" - undefined -
"Nothing, but I didn't set that." - null -
"Nothing, and I did set that." - an object -
"Anybody got the key?" - an array -
"I order you to be indexed." - NaN -
"Well, now you're just showing off."
Some of these won't work using the typeof operator. If you're stuck, try Googling "JavaScript how to tell if a value is of type ____".
Write a function rounder that takes two arguments: float and roundingSetting.
floatwill be a number with a decimalroundingSettingwill be one of 3 values:up,down, orhonest.
rounder should return the float value rounded to an integer based on the following value of roundingSetting:
- if
roundingSettingis"up"return thefloatrounded up - if
roundingSettingis"down"return thefloatrounded down - if
roundingSettingis"honest"return thefloatrounded to the nearest integer.
Check out which Math method to use for each scenario!
Write a function formatName that takes two arguments: a string first and a string last. It should return a single string with the full name where only the first letter of each name is capitalized and the rest is lowercase.
formatName("john", "doe") // "John Doe"
formatName("MARY", "jane") // "Mary Jane"
formatName("MarY", "JAne") // "Mary Jane"Write a function extractDomain that takes one argument: a string email. It should return the domain part from an email address (everything after the "@" symbol).
extractDomain("[email protected]") // "example.com"
extractDomain("[email protected]") // "google.com"
extractDomain("[email protected]") // "marcylab.org"Write a function startsWithVowel that takes one argument: a string str. It should return true if the string starts with a vowel (a, e, i, o, u), case-insensitive, and false otherwise.
startsWithVowel("apple") // true
startsWithVowel("banana") // false
startsWithVowel("Elephant") // true
startsWithVowel("zebra") // falseWrite a function rotate that takes two arguments: a string str and a number num. It should "rotate" the characters of the string by moving characters from the end to the front a specified number of times and return the new string.
rotate("hello", 1) // "ohell"
rotate("hello", 3) // "llohe"
rotate("world", 2) // "ldwor"
rotate("abc", 1) // "cab"In modify.js we have the function wildlyBiasedReview that's not currently using a guard clause.
Keep the functionality the same, but use a guard clause to simplify the logic.
A guard clause is an if statement that returns before the rest of the code gets to execute. When used correctly, it can save you from having to write else or else if statements.
In modify.js we have the function getWeatherReport that takes an integer temperature. It compiles a weatherReport string, logs it out, then logs "And that's your report!". However, it is quite repetitive.
Can you refactor the code so that we only have to log weatherReport and the string "And that's your report!" one time each?
In debug.js we have a function called coolnessGauge. It's using a ternary, but it's returning the exact opposite of what we want. Can you fix it by reading what the tests expect?
In debug.js we have the function funkoPopAddictionLevel. It takes an integer numOfFunkoPops and returns a message of support (or concern). However, no matter what, it just only ever returns "No pops? Maybe try one." or "Only a few? Keep having fun!".
Please read the tests and make sure all the messages are returned properly. To help you understand.
Not sure what a FunkoPop is? Just google it.
Oh man, in debug.js someone tried getting real clever and chaining some ternarys together in returnPositiveNegativeZero. However...the logic is broken and the tests are failing. Can you fix this function and only use 1 ternary (if at all) so that the tests pass?
You may already be aware of Switch Cases that are an alternative to if/else statements. If the mood strikes you try your hand at the switch versions of measureRainSwitch and rounderSwitch in bonus-switch.js.
To test your code, open up the bonus-switch.spec.js file and remove the .skip from each it test.
This is also a good article on switch to check out.