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From: Manuel Collado <m-collado@users.sourceforge.net>
Newsgroups: comp.lang.ada
Subject: Re: "functional" programming in Ada
Date: Tue, 6 Mar 2018 23:16:09 +0100
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Xref: reader02.eternal-september.org comp.lang.ada:50866
Date: 2018-03-06T23:16:09+01:00
List-Id: <comp.lang.ada>

El 06/03/2018 a las 17:37, Dmitry A. Kazakov escribió:
> On 06/03/2018 17:00, Manuel Collado wrote:
>>
>> Well, it may sound a bit heterodox, but IMHO functional programming is
>> just a subset of imperative (= procedural) programming.
>>
>> - Functional programming = expressions
>> - Imperative programming = expressions + variables + procedural actions
>
> Imperative is in opposition to declarative. Another axis is stateless
> vs. stateful. Procedural is usually attributed to the method of
> decomposition: procedural vs. object vs. functional vs. data/event
> driven etc.
>
> Ada used to strictly separate imperative from declarative and took care
> about the states, especially about the correspondence between the
> program state and problem domain. Then Ada supported both procedural and
> object decomposition, even Ada 83 with its abstract data types.

Did I mentioned the word "declarative"?

Functional and declarative are different axis. Fans of functional 
programming claim it is declarative "per se". Not me.

Expressions without side-effects are functional, and not necessarily 
declarative. Prolog is declarative, and not functional.

Regards.
-- 
Manuel Collado - http://lml.ls.fi.upm.es/~mcollado