Enhance Productivity and Code Quality GH-300 Practice Questions (Page 4)

Questions 16–20

1. 16expert · hard

   A developer is refactoring a Ruby method that has multiple `if-elsif` branches to use a case statement for better readability. The method is covered by tests, but the developer is concerned about subtle behavior differences, such as the use of `==` vs `===` in comparisons. What is the safest way to proceed?

   • ALeave the method as-is because refactoring is too risky.
   • BManually convert the method to a case statement without running tests.
   • CSelect the method and ask Copilot to convert it to a case statement, then run the existing test suite.
   • DAsk Copilot to generate documentation for the method instead of refactoring.
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2. 17application · easy

   A developer has just written a complex C# method that calculates shipping costs based on weight, destination, and delivery speed. The method works correctly but has no comments or XML documentation. The team's coding standards require every public method to have XML doc comments. What is the most efficient way to meet this requirement?

   • APlace the cursor above the method, type '///', and accept the XML doc comment that Copilot generates.
   • BUse Copilot to generate a new method from scratch with documentation included.
   • CAsk Copilot to refactor the method to be simpler, then add comments manually.
   • DWrite a one-line comment above the method explaining its purpose.
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4. 18foundation · easy

   A developer wants Copilot to generate a new Python function that calculates the factorial of a number. Which action is the most direct way to get Copilot to generate this code?

   • AUse the command palette to run 'Generate Function' and then select 'factorial' from a list.
   • BWrite a comment like '# function to calculate factorial' and then press Enter to see a suggestion.
   • CCreate a new repository and enable Copilot in the settings, then it will automatically write the function.
   • DOpen a new file and type 'factorial' then press Tab to accept the first suggestion.
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5. 19expert · hard

   A developer is onboarding to a large monorepo with multiple microservices written in different languages. They need to understand how a specific service handles authentication before making a change. The service uses a custom middleware and several internal libraries. The developer wants to learn the flow quickly without disrupting their current task. What is the most effective approach?

   • ASearch the web for the internal libraries' documentation.
   • BRead through every file in the service's directory manually.
   • CAsk Copilot to generate unit tests for the authentication middleware.
   • DUse Copilot Chat to ask for an explanation of the authentication flow, then generate a sequence diagram from the response.
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6. 20foundation · easy

   How does GitHub Copilot help reduce context switching for developers?

   • ABy providing code suggestions and answers directly in the editor.
   • BBy sending notifications to the developer's phone.
   • CBy creating a separate chat window for each question.
   • DBy automatically opening a web browser with relevant documentation.
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