[odipar]

I've come full cycle:

0) Procedural

1) OO

2) FP

3) Really started to dislike mutability

4) Developed various FP frameworks

5) Back to pure (immutable!) OO and messages!

[submeta]

What made you transition from 4) to 5) ?

[odipar]

Managing state in (standard) FP doesn't compose that well.

Lenses look like a solution to transition 'deep' immutable state, but I find them cumbersome: YMMV.

Object Orientation has excellent composability with regards to state and with minimum fuss.

The step I took is to eradicate mutable OO state, and replace it with a pure OO substrate.