MCQs on Creating and Managing Mix Projects | Elixir

In Elixir, Mix is the go-to tool for creating, building, and managing projects. It simplifies many tasks such as handling dependencies, versioning, and releasing your applications. This guide explores how to use Mix for building projects, managing dependencies with Hex, version control, and creating reusable libraries. Mastering Mix is essential for efficient Elixir development.

1. Building Projects with Mix

1. Which command is used to create a new Elixir project using Mix?
   • a) mix create project_name
   • b) mix new project_name
   • c) elixir mix new project_name
   • d) elixir create project_name
2. What does the mix deps.get command do in Elixir?
   • a) It installs dependencies specified in the mix.exs file.
   • b) It fetches updates for the current project.
   • c) It builds the project.
   • d) It updates the Elixir version.
3. How do you compile an Elixir project using Mix?
   • a) mix compile
   • b) mix build
   • c) elixir compile
   • d) mix project.compile
4. What is the purpose of the mix test command in Elixir?
   • a) It starts a new test environment.
   • b) It runs the tests in the project.
   • c) It checks the project’s dependencies.
   • d) It compiles test files.
5. To generate documentation for an Elixir project, which command is used?
   • a) mix doc
   • b) mix docs
   • c) mix generate_docs
   • d) mix compile_docs
6. Which of the following Mix commands is used to start the project’s interactive shell?
   • a) mix console
   • b) mix shell
   • c) mix run
   • d) mix start
7. How do you create a new Elixir application inside an existing project with Mix?
   • a) mix new app_name
   • b) mix create app_name
   • c) mix new app_name --module
   • d) mix new app_name --app
8. How would you run a specific task from the Mix project?
   • a) mix task_name
   • b) elixir mix task_name
   • c) mix.run task_name
   • d) elixir task_name
9. What is the default directory where Mix creates files for a new project?
   • a) /projects
   • b) /lib
   • c) /src
   • d) /my_project
10. How do you generate a new Mix task for a project?

• a) mix generate task
• b) mix new task_name
• c) mix task
• d) mix create task_name

2. Managing Dependencies with Hex

11. What is Hex used for in Elixir?

• a) Compiling Elixir code
• b) Managing project dependencies
• c) Running tests
• d) Building the application

12. How do you add a dependency to an Elixir project?

• a) By running mix add dep_name
• b) By editing mix.exs and adding the dependency
• c) By running mix deps.add dep_name
• d) By running hex add dep_name

13. To fetch and install all dependencies specified in mix.exs, which command should you use?

• a) mix deps.install
• b) mix deps.get
• c) hex deps.get
• d) mix install deps

14. What does the mix deps.update command do in Elixir?

• a) It removes unused dependencies.
• b) It updates project dependencies to their latest versions.
• c) It installs new dependencies.
• d) It updates the project to the latest version.

15. In which file do you define project dependencies in an Elixir Mix project?

• a) project.exs
• b) mix.config
• c) mix.exs
• d) deps.exs

16. What command is used to remove a dependency from an Elixir project?

• a) mix deps.remove
• b) mix deps.delete
• c) mix remove dep_name
• d) mix clean deps

17. How can you view the list of all dependencies in an Elixir project?

• a) mix list deps
• b) mix deps.list
• c) mix deps
• d) hex deps

18. What does mix deps.compile do in an Elixir project?

• a) It installs the dependencies.
• b) It compiles the dependencies if needed.
• c) It checks for outdated dependencies.
• d) It updates all dependencies.

19. How do you specify the version of a dependency in mix.exs?

• a) :dep_name, "1.2.3"
• b) :dep_name, "~> 1.2.3"
• c) :dep_name, ">= 1.2.3"
• d) :dep_name, "< 1.2.3"

20. Which command is used to check for outdated dependencies in a Mix project?

• a) mix deps.outdated
• b) mix deps.check
• c) mix deps.update --all
• d) mix deps.info

3. Versioning and Release Management

21. Which command is used to create a release of your Elixir application?

• a) mix release.create
• b) mix build
• c) mix release
• d) mix prod

22. What is the purpose of the mix release command in Elixir?

• a) It compiles the project for production.
• b) It builds and packages the project into a release.
• c) It deploys the project to a server.
• d) It generates the version number for the release.

23. How do you set the version of your Elixir application in the mix.exs file?

• a) version: "1.0.0"
• b) version = "1.0.0"
• c) version: :version
• d) app_version: "1.0.0"

24. To specify a custom release name, which option can you pass to mix release?

• a) --name
• b) --release_name
• c) --custom-name
• d) --app_name

25. How do you specify environment variables for a release in Elixir?

• a) Through the mix.env file
• b) Through the config/releases.exs file
• c) Through the mix.exs file
• d) Using the mix environment command

26. What is the default folder for storing Elixir release builds?

• a) /_build/release/
• b) /releases/
• c) /build/
• d) /prod/

27. Which command would you use to start an application after creating a release?

• a) mix start
• b) mix run
• c) mix release.start
• d) bin/my_app start

28. How do you manage configuration settings for different environments in Elixir releases?

• a) By using the config/prod.exs file
• b) By passing environment variables directly
• c) By using config/releases.exs
• d) By editing the mix.exs file

29. What is the default release name generated by mix release for an Elixir project?

• a) my_app_release
• b) prod
• c) app_name
• d) The name defined in mix.exs

30. What does the mix release.clean command do in Elixir?

• a) It removes old release files.
• b) It compiles the project again.
• c) It deletes temporary build files.
• d) It cleans up the project dependencies.

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Answer Table

Qno	Answer (Option with Text)
1	b) mix new project_name
2	a) It installs dependencies specified in the mix.exs file.
3	a) mix compile
4	b) It runs the tests in the project.
5	b) mix docs
6	c) mix run
7	c) mix new app_name --module
8	a) mix task_name
9	b) /lib
10	d) mix create task_name
11	b) Managing project dependencies
12	b) By editing mix.exs and adding the dependency
13	b) mix deps.get
14	b) It updates project dependencies to their latest versions.
15	c) mix.exs
16	a) mix deps.remove
17	b) mix deps.list
18	b) It compiles the dependencies if needed.
19	b) :dep_name, "~> 1.2.3"
20	a) mix deps.outdated
21	c) mix release
22	b) It builds and packages the project into a release.
23	a) version: "1.0.0"
24	b) --release_name
25	b) Through the config/releases.exs file
26	a) /_build/release/
27	d) bin/my_app start
28	c) By using config/releases.exs
29	d) The name defined in mix.exs
30	a) It removes old release files.