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Functional programming is a powerful paradigm in the programming world, where strict rules are applied in order to reduce bugs to a point where they are almost impossible to write (in many common cases). 

It doesn't come without some difficulties though, and so this video aims to explain very simply, the concepts that underline the two main functional paradigms:

- (Normal) Functional - the paradigm we can borrow techniques from in many non-functional languages.
- Purely Functional - the paradigm that applies all the rules strictly, in order to be as bug free as possible, and the paradigm that covers most functional languages.

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0:00 A functional welcome
0:33 Coderized intro
0:40 The imperative and declarative paradigms
1:32 The functional paradigm
1:50 First-class functions
2:07 Closures
2:42 Closures example
3:40 Using functional
3:45 Higher order functions
4:07 Immutability (and side-effects)
4:43 Currying and objects with closures
6:07 The purely functional paradigm
6:42 Evaluation vs execution
6:55 Strict immutability
7:06 Monads
7:23 Using what we can
7:38 Benefits and drawbacks
8:21 Keeping an open-mind
8:40 RUNME (Sponsor)
9:46 End credits

Szymon Omieciński

HTMX

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Community Picks

The purest coding style, where bugs are near impossible

Another good approach I really like is DST (Deterministic Simulation Testing) developed by NASA (I think) and popularized by TigerBeetle.
DST may be overkill for most applications but for really really critical systems, such as a NASA space shuttle, it’s somewhat the only realistic way to create 99.9% bug-free code.

Nice video about fp, now it makes a little more sense to me