Functional programming aims to mimic mathematical functions by making computation based on functions rather than processes with side effects. It uses functions, higher-order functions, immutability, recursion, and lazy evaluation as building blocks rather than objects, encapsulation, polymorphism, and inheritance. Code in a functional style, such as using sum rather than a for loop, can have benefits including being easier to reuse and test as well as enabling concurrency due to a lack of side effects from immutability.

1. Leonardo Amarilho

2. Fundamentals
The objective of the design of a
Functional Programming is to mimic
mathematical functions to the
greatest extend possible.
The basic process of computation is
fundamentally diferent in a functional
than in an imperative language.

3. Object-Oriented
Programming
Functional
Programming

4. How I will compare?

5. OO Building Blocks
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Object
Encapsulation
Polymorphism
Inheritance

6. Functional Building Blocks
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Functions
Higher-order functions
Immutable
Recursion
Lazy evaluation

7. OO Style
int total = 0;
for elem in elems{
total++;
}
return total;

8. Functional Style
(0...10).sum

9. Benefits
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Easier to reuse and test;
Good for concurrency;
No side-effects;
Immutability;