[RFC] provide a `not` function about functional-php HOT 8 CLOSED

I like it. But congratulations, you are traveling uncharted territory: operator functions. I can think of more: eq(), neq(), etc. So that one can write filter($list, and(neq('foo'), neq('bar'))) and so on. Interested on working on the whole topic?

from functional-php.

right! thanks

from functional-php.

Interesting topic indeed :)

I can try to implement a few of them, but this could be an iterative work, right?
Do you have an idea of a separate namespace for that?

Small note, do we need to alias and and or functions because they are reserved keywords ?

from functional-php.

@lstrojny another question regarding an implementation detail of neq.
Let's say we have implemented not and eq.

Should we implement neq by simply composing neq = not('eq') ?
Or should we use directly the != operator?

from functional-php.

@docteurklein I always try to implement the most basic version of a function, rather not reusing existing functionality but full reimplementing them. Leads to uglier code but that’s OK for primitives.

from functional-php.

agreed. I ended up using the native operator (much easier)

from functional-php.

The native operator is handy but it's not a function. When refactoring some code into a function pipeline with compose it's much better to have a not function. Also, you can achieve a declarative code style that doesn't need native operators when you have functions for everything :D

from functional-php.

This could be closed, I guess.
https://github.com/lstrojny/functional-php/blob/master/src/Functional/Not.php

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