Article about functional programming in kotlin#133
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patrickwilmes wants to merge 1 commit intoZuehlke:mainfrom
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Article about functional programming in kotlin#133patrickwilmes wants to merge 1 commit intoZuehlke:mainfrom
patrickwilmes wants to merge 1 commit intoZuehlke:mainfrom
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abishekanthony07
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Nov 13, 2025
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All in all the Blog is really expressive and on point!
I have mostly added suggestions to Kotlin code. Feel free to challenge them!
Thank you Patrick!
Co-authored-by: Abishek Anthony <Abishek.Anthony@zuehlke.com>
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| ## Functional and Object-Oriented: Not Opposites, but Complements | ||
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| There’s no single “superior” paradigm. Paradigms are tools, each emphasizing a different aspect of design. |
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| There’s no single “superior” paradigm. Paradigms are tools, each emphasizing a different aspect of design. | |
| There’s no single “superior” paradigm. Paradigms are tools, each emphasizing a different aspect of design. | |
| - **OOP** models the world with _entities_ and _behavior_. It gives structure and relationships. | ||
| - **FP** models _data transformations_. It focuses on purity, predictability, and composition. | ||
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| Viewed together: |
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| Viewed together: | |
| Viewed together: | |
| - **FP** models _data transformations_. It focuses on purity, predictability, and composition. | ||
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| Viewed together: | ||
| > **Use OOP to give your project structure, and FP to express logic clearly.** |
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| > **Use OOP to give your project structure, and FP to express logic clearly.** | |
| > **Use OOP to give your project structure, and FP to express logic clearly.** | |
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| ### What Makes a Function Pure? | ||
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| A pure function must satisfy two requirements: |
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| A pure function must satisfy two requirements: | |
| A pure function must satisfy two requirements: | |
| } | ||
| ``` | ||
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| This is pure because: |
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| This is pure because: | |
| This is pure because: | |
| You can think of a **monad** as a _computation context_ — a box that carries both a value and its meaning | ||
| (was it successful, optional, deferred?). | ||
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| A monad provides three operations: |
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| A monad provides three operations: | |
| A monad provides three operations: | |
| } | ||
| ``` | ||
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| **Monads let you:** |
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| **Monads let you:** | |
| **Monads let you:** | |
| - Keep business logic clean | ||
| - Maintain purity—no hidden effects | ||
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| Common monads you’ll encounter: |
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| Common monads you’ll encounter: | |
| Common monads you’ll encounter: | |
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| ## When to Use Which Paradigm | ||
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| ### Functional Programming Shines When |
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| ### Functional Programming Shines When | |
| ### Functional Programming Shines When | |
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Instead of using titles, I would have used a different format:
Functional programming shines when ...
- ... you're tranforming data.
- ... logic is complex but composable
- ...
| - You need thread safety | ||
| - You want testability and predictability | ||
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| ### OOP Shines When |
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| ### OOP Shines When | |
| ### OOP Shines When | |
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