The classical introductory exercise. Just say "Hello, World!".
"Hello, World!" is the traditional first program for beginning programming in a new language or environment.
The objectives are simple:
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Write a function that returns the string "Hello, World!".
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Run the test suite and make sure that it succeeds.
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Submit your solution and check it at the website.
If everything goes well, you will be ready to fetch your first real exercise.