38 lines
4.5 KiB
Markdown
38 lines
4.5 KiB
Markdown
# JavaScript Exercises
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These JavaScript exercises are intended to complement the JavaScript content on The Odin Project (TOP). They should only be done when instructed during the course of the curriculum.
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**Note:** The `generator-exercise` file is not actually an exercise; it is a script that generates exercises. It was created to help efficiently write these exercises.
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## Contributing
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If you have a suggestion to improve an exercise, an idea for a new exercise, or notice an issue with an exercise, please feel free to open an issue after thoroughly reading our [contributing guide](https://github.com/TheOdinProject/theodinproject/blob/main/CONTRIBUTING.md) in our main TOP repo.
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## How To Use These Exercises
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1. Fork and clone this repository. To learn how to fork a repository, see the GitHub documentation on how to [fork a repo](https://docs.github.com/en/get-started/quickstart/fork-a-repo).
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- Copies of repositories on your machine are called clones. If you need help cloning to your local environment you can learn how from the GitHub documentation on [cloning a repository](https://docs.github.com/en/github/creating-cloning-and-archiving-repositories/cloning-a-repository-from-github/cloning-a-repository).
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2. Before you start working on any exercises, you should first ensure you have the following installed:
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- **NPM**. You should have installed NPM already in our [Installing Node.js](https://www.theodinproject.com/paths/foundations/courses/foundations/lessons/installing-node-js) lesson. Just in case you need to check, type `npm --version` in your terminal. If you get back `Command 'npm' not found, but can be installed with:`, **do not follow the instructions in the terminal** to install with `apt-get` as this causes permission issues. Instead, go back to the installation lesson and install Node with NVM by following the instructions there.
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- **Jest**. After cloning this repository to your local machine and installing NPM, go into the newly created directory (`cd javascript-exercises`) and run `npm install`. This will install Jest and set up the testing platform based on our preconfigured settings.
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3. Each exercise includes the following:
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- A markdown file with a description of the task, an empty (or mostly empty) JavaScript file, and a set of tests.
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- A `solutions` directory that contains a solution and the same test file with all of the tests unskipped.
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To complete an exercise, you'll need to go to the exercise directory with `cd exerciseName` in the terminal and run `npm test exerciseName.spec.js`. This should run the test file and show you the output. When you first run a test, it will fail. This is by design! You must open the exercise file and write the code needed to get the test to pass.
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4. Some of the exercises have test conditions defined in their spec file as `test.skip` compared to `test`. This is purposeful. After you pass one `test`, you will change the next `test.skip` to `test` and test your code again. You'll do this until all conditions are satisfied. **All tests must pass at the same time**, and you should not have any `test.skip` instances by the time you finish an exercise.
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5. Once you successfully finish an exercise, check the `solutions` directory within each exercise to compare it with yours.
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- You should not be checking the solution for an exercise until you finish it!
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- Keep in mind that TOP's solution is not the only solution. Generally as long as all of the tests pass, your solution should be fine.
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6. Do not submit your solutions to this repo, as any PRs that do so will be closed without merging.
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**Note**: Due to the way Jest handles failed tests, it may return an exit code of 1 if any tests fail. NPM will interpret this as an error and you may see some `npm ERR!` messages after Jest runs. You can ignore these, or run your test with `npm test exerciseName.spec.js --silent` to supress the errors.
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The first exercise, `helloWorld`, will walk you through the process in-depth.
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## Debugging
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To debug functions, you can run the tests in the Visual Studio Code debugger terminal. You can open this by clicking the "Run and Debug" icon on the left or pressing <kbd>Ctrl</kbd> + <kbd>Shift</kbd> + <kbd>D</kbd>, then clicking JavaScript Debug Terminal. You will be able to set breakpoints as you would in the Chrome DevTools debugger. You can run `npm test exerciseName.spec.js` to then execute your code up until your breakpoint and step through your code as necessary. **NOTE**: To take advantage of the debugger, you **MUST** run the script in the debugger terminal, not the bash or zsh terminal.
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