Code Challenge: Reduce

Overview

Read this overview.

Video

Watch the video for this class from the demo playlist.

Demonstration

Look through these sample problems.

Challenges

1. Navigate to the javascript folder within your data-structures-and-algorithms repository.
2. Create a new branch for this challenge called reduce
   • git checkout -b reduce
3. Retrieve the code challenge from the system
   • npm run get-challenge 06
4. In your terminal, from the javascript folder, run npm test 06 to execute the tests in this file for this challenge.
   • At this point you will see the failed tests scroll through your terminal window with a brief report of the number of failed tests at the bottom.
   • If you do not see this, verify your installation of Jest by typing npx jest --version in your terminal. Filename typos can make things break!
5. You’ll see a series of challenges in the challenges-06.test.js file each of which has an associated test at the bottom of the file.
   • HINT #1: Refer to the tests to see how the code you’ll need to write will be used.
   • *HINT #2: Changing describe to xdescribe on any test will cause the test runner to skip that test. This may help you to keep focused on one test at a time.
6. Beginning with Challenge 1, write code necessary to make the test pass. Let the error messages guide you.
7. Once the test is passing:
   • Refactor as needed.
   • Perform a git add and a git commit to mark your work on that challenge.
   • … Then, move on to the next challenge and repeat.

Note, you can also run npm test (without a challenge number) to run all of the tests for every code challenge file assignment during the course all at once. This can get “noisy”, but it’s an opportunity to get a view of your overall progress

Submission

When you have completed your code challenges (tests are passing) and/or are at the alotted time:

• Perform a git push of your code to your repository.
• Create a pull request from your current branch to the main branch.
• Submit a link to the PR for grading and look for inline comments from your grader.
• Once grading is completed, merge this PR to your main branch.
• Remember to continually git pull as you merge your code challenges so you stay in sync.

You will be able to see a test coverage report in GitHub on the Actions tab of your data-structures-and-algorithms repository. It should match what you saw on your terminal in the above steps. Your graders will be looking at this as well.