New concept: Optional #2913

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exercism:mainfrom

josealonso:2555-new-concept-optional

Commits on Feb 10, 2025

Write explanation for the Optional concept, as well as the test file, the stub implementation, the reference solution and other required files. Some files must be modified. This is a draft.
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Delete unused file.
josealonso
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Commits on Feb 11, 2025

Explain the flatmap operation. The hints.md and introduction.md files are not over yet.
josealonso
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Commits on Feb 15, 2025

Commits on Feb 23, 2025

Use @BeforeEach instead of @BeforeAll.
josealonso
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Commits on Feb 24, 2025

Simplify the solution and the asked methods so streams are not used.
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Commits on Feb 25, 2025