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From day 1 of my programming career, I started with object-oriented programming. However, I'm interested in learning other paradigms (something which I've said here on SO a number of times is a good thing, but I haven't had the time to do). I think I'm not only ready, but have the time, so I'll be starting functional programming with F#.
However, I'm not sure how to structure much less design applications. I'm used to the one-class-per-file and class-noun/function-verb ideas in OO programming. How do you design and structure functional applications?
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Functional programming refers to programming computers where functions serve as the primary mechanism for manipulating data. A function is said to be pure when it takes inputs, manipulates those inputs, and returns output, all without having to store some temporary or external state.
In object-oriented development, we are all familiar with design patterns such as the Strategy pattern and Decorator pattern, and design principles such as SOLID. The functional programming community has design patterns and principles as well.
Functional Programming is a programming paradigm that treats computation as the evaluation of mathematical functions and avoids changing-state and mutable data. In functional code, the output value of a function depends only on the arguments that are passed to the function.
Are the SOLID principles applicable to Functional Programming? Of course. Functional programmers want to separate their code to avoid crosstalk between responsibilities and users. They want to minimize the number of modules affected by a change.
Read the SICP.
Also, there is a PDF Version available.
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