rotten news relay - comp.lang.scheme - Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought

Subject: Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought
From: George Neuner
Newsgroups: comp.lang.scheme
Organization: i2pn2 (i2pn.org)
Date: Sat, 2 Mar 2024 03:52 UTC
References: 1 2 3 4 5 6 7

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From: gneuner2@comcast.net (George Neuner)
Newsgroups: comp.lang.scheme
Subject: Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought
Date: Fri, 01 Mar 2024 22:52:54 -0500
Organization: i2pn2 (i2pn.org)
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On Fri, 01 Mar 2024 14:24:37 -0800, Paul Rubin
<no.email@nospam.invalid> wrote:

>George Neuner <gneuner2@comcast.net> writes:
>> Named Let is not a binding construct - it's a looping construct.
>> See 11.16
>
>Thanks, I wonder if that is something relatively recent (i.e. arrived
>between r4rs and r6rs). It is kind of ugly and I'm used to seeing
>nested defines. Maybe there are some situations where the named let is
>more convenient. Or maybe I can get used to it.
>
>Part of the idea of Guile was to be the execution engine for various
>other languages that would get transpiled to Scheme, but idk if that
>went anywhere.

Named Let was formally added to Scheme in R5RS, but it was recognized
as being a legal variant at least as far back as R3RS.

=======================

R3RS [4.2.4 Iteration]:
R4RS [4.2.4 Iteration]:

(let <variable> <bindings> <body>) syntax

Some implementations of Scheme permit a variant on the
syntax of let called \named let" which provides a more
general looping construct than do, and may also be used
to express recursions.

Named let has the same syntax and semantics as ordinary
let except that <variable> is bound within <body> to
a procedure whose formal arguments are the bound vari-
ables and whose body is <body>. Thus the execution of
hbodyi may be repeated by invoking the procedure named
by <variable>.

(let loop ((numbers '(3 -2 1 6 -5))
(nonneg '())
(neg '()))
(cond ((null? numbers) (list nonneg neg))
((>= (car numbers) 0)
(loop (cdr numbers)
(cons (car numbers) nonneg)
neg))
((< (car numbers) 0)
(loop (cdr numbers)
nonneg
(cons (car numbers) neg)))))
==> ((6 1 3) (-5 -2))

=======================

R5RS [4.2.4 Iteration]:

(let <variable> <bindings> <body>) library syntax

“Named let” is a variant on the syntax of let which pro-
vides a more general looping construct than do and may
also be used to express recursions. It has the same syn-
tax and semantics as ordinary let except that <variable>
is bound within <body> to a procedure whose formal argu-
ments are the bound variables and whose body is <body>.
Thus the execution of <body> may be repeated by invoking
the procedure named by <variable>.

=======================

Unfortunately I don't have any references older than R3RS.

George

Subject: Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought
From: Nuno Silva
Newsgroups: comp.lang.scheme, comp.lang.lisp
Organization: A noiseless patient Spider
Date: Sun, 3 Mar 2024 09:23 UTC
References: 1 2 3 4 5 6 7 8 9

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From: nunojsilva@invalid.invalid (Nuno Silva)
Newsgroups: comp.lang.scheme,comp.lang.lisp
Subject: Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought
Date: Sun, 03 Mar 2024 09:23:02 +0000
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On 2024-03-01, Kaz Kylheku wrote:

> On 2024-02-29, Lawrence D'Oliveiro <ldo@nz.invalid> wrote:
>> On Wed, 28 Feb 2024 15:54:48 -0800, Paul Rubin wrote:
>>
>>> Lawrence D'Oliveiro <ldo@nz.invalid> writes:
>>>>
>>>> Why would that be better?
>>>
>>> You are trying to handle N digits and your algorithm does O(N**2)
>>> comparisons. Ok, I guess the whole search strategy is impractical if N
>>> is larger than just a few, and in traditional Mastermind N=4, so maybe
>>> that isn't an issue.
>>
>> “Premature optimization is the root of all evil.”
>> -- variously attributed to Tony Hoare or Donald Knuth
>
> Pinning it down more precisely at this stage would be premature
> attribution.

I sometimes feel that this specific sentence from Knuth's quote might be
being used as a way to discourage even thinking about optimization, when
the intent of the whole quote might be actually the opposite: yes, there
are places where it doesn't bring much benefit to optimize, but there
are also the parts where it *does*.

"We should forget about small efficiencies, say about 97% of the
time: premature optimization is the root of all evil. Yet we should
not pass up our opportunities in that critical 3%."

But I'll read the whole thing when I can, at this point I'm not even
sure I've read this before or not...

https://dl.acm.org/doi/10.1145/356635.356640

--
Nuno Silva
(not reading comp.lang.scheme, just comp.lang.lisp)

Subject: Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought
From: Lawrence D'Oliv
Newsgroups: comp.lang.scheme, comp.lang.lisp
Organization: A noiseless patient Spider
Date: Sun, 3 Mar 2024 20:05 UTC
References: 1 2 3 4 5 6 7 8 9 10

Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: ldo@nz.invalid (Lawrence D'Oliveiro)
Newsgroups: comp.lang.scheme,comp.lang.lisp
Subject: Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code
Sought
Date: Sun, 3 Mar 2024 20:05:58 -0000 (UTC)
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On Sun, 03 Mar 2024 09:23:02 +0000, Nuno Silva wrote:

> yes, there are places where it doesn't bring much benefit to optimize,
> but there are also the parts where it *does*.

The point being, you determine those by actually running benchmarks on
your code. Programmers who assume they know which parts need speeding up a
priori are often surprised to discover they’re wrong.

Subject: Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought
From: HenHanna
Newsgroups: comp.lang.scheme, comp.lang.lisp
Organization: novaBBS
Date: Sun, 3 Mar 2024 22:56 UTC
References: 1 2 3 4 5 6 7 8 9 10

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From: HenHanna@dev.null (HenHanna)
Newsgroups: comp.lang.scheme,comp.lang.lisp
Subject: Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought
Date: Sun, 3 Mar 2024 22:56:25 +0000
Organization: novaBBS
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sum ( i != j and a == b for i, a in enumerate(candidate)
for j, b in enumerate(answer) )

--------- i certainly enjoyed seeing this code. Thanks for sharing it!

it's written in a [functional] or [mathematical] or "comprehensive" style.

Nuno Silva wrote:

> On 2024-03-01, Kaz Kylheku wrote:

>> On 2024-02-29, Lawrence D'Oliveiro <ldo@nz.invalid> wrote: .....

>>>
>>> “Premature optimization is the root of all evil.”
>>> ----- variously attributed to Tony Hoare or Donald Knuth

and not Perlis?

>> Pinning it down more precisely at this stage would be premature attribution.

> I sometimes feel that this specific sentence from Knuth's quote might be
> being used as a way to discourage even thinking about optimization, when
> the intent of the whole quote might be actually the opposite: yes, there
> are places where it doesn't bring much benefit to optimize, but there
> are also the parts where it *does*.

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From: ldo@nz.invalid (Lawrence D'Oliveiro)
Newsgroups: comp.lang.scheme,comp.lang.lisp
Subject: Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code
Sought
Date: Sun, 3 Mar 2024 23:27:00 -0000 (UTC)
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On Sun, 3 Mar 2024 22:56:25 +0000, HenHanna wrote:

> it's written in a [functional] or [mathematical] or
> "comprehensive" style.

Yup, I like writing functional constructs in primarily-procedural
languages. It’s better than trying to work in supposedly pure-functional
languages.

Python also uses the term “comprehension” for certain uses of that kind of
construct.

> and not Perlis?

I like another quote of his: “There are two ways to write error-free
programs; only the third one works.”

Subject: Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought
From: HenHanna
Newsgroups: comp.lang.scheme, comp.lang.lisp
Organization: novaBBS
Date: Mon, 4 Mar 2024 10:30 UTC
References: 1 2 3 4 5 6 7 8 9 10 11 12

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From: HenHanna@dev.null (HenHanna)
Newsgroups: comp.lang.scheme,comp.lang.lisp
Subject: Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought
Date: Mon, 4 Mar 2024 10:30:26 +0000
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Lawrence D'Oliveiro wrote:

> On Sun, 3 Mar 2024 22:56:25 +0000, HenHanna wrote:

>> it's written in a [functional] or [mathematical] or "comprehensive" style.

> Yup, I like writing functional constructs in primarily-procedural
> languages. It’s better than trying to work in supposedly pure-functional
> languages.

> Python also uses the term “comprehension” for certain uses of that kind of construct.

>> and not Perlis?

> I like another quote of his: “There are two ways to write error-free
> programs; only the third one works.”

i love it.... i thought it must be THE most enigmatic of his quotes, but...

https://www.cs.yale.edu/homes/perlis-alan/quotes.html

38. Structured Programming supports the law of the excluded middle. --------- ??????????

39. Re graphics: A picture is worth 10K words - but only those to describe the picture. Hardly any sets of 10K words can be adequately described with pictures.

40. There are two ways to write error-free programs; only the third one works.

41. Some programming languages manage to absorb change, but withstand progress. -------- For example?????

42. You can measure a programmer's perspective by noting his attitude on the continuing vitality of FORTRAN.

43. In software systems, it is often the early bird that makes the worm. ---------- meaning, ...that introduces the BUG ?

44.Sometimes I think the only universal in the computing field is the fetch-execute cycle.

Subject: Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought
From: Lawrence D'Oliv
Newsgroups: comp.lang.scheme, comp.lang.lisp
Organization: A noiseless patient Spider
Date: Mon, 4 Mar 2024 21:04 UTC
References: 1 2 3 4 5 6 7 8 9 10 11 12 13

Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: ldo@nz.invalid (Lawrence D'Oliveiro)
Newsgroups: comp.lang.scheme,comp.lang.lisp
Subject: Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code
Sought
Date: Mon, 4 Mar 2024 21:04:45 -0000 (UTC)
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On Mon, 4 Mar 2024 10:30:26 +0000, HenHanna wrote:

> 41. Some programming languages manage to absorb change, but withstand
> progress. -------- For example?????

PHP being the obvious one. It manages to copy features from other
languages (initially Perl, currently Python) without quite understanding
how they’re supposed to work, and so completely botching them.

> 42. You can measure a programmer's perspective by noting his attitude on
> the continuing vitality of FORTRAN.

That was the first language I learned, even before I got my hands on a
computer, back in the day. I have been through so many others since then,
I thought Fortran had had its day.

But have you looked at the specs for Fortran-90 onwards? It has gone free-
format. It has proper control constructs, so you can write entire programs
without statement labels at all. It has local variables and recursion. It
has structured types and something resembling object orientation. (OK, so
pointers might still be a bit clunky.)

And above all, it has “coarrays”, for partitioning work among the nodes of
a massively parallel supercomputer. If you want proof that Fortran is
still relevant to the modern computing era, this is it.

Subject: Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought
From: B. Pym
Newsgroups: comp.lang.scheme
Organization: A noiseless patient Spider
Date: Sun, 26 May 2024 08:11 UTC
References: 1 2 3 4

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From: No_spamming@noWhere_7073.org (B. Pym)
Newsgroups: comp.lang.scheme
Subject: Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought
Date: Sun, 26 May 2024 08:11:11 -0000 (UTC)
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On 3/1/2024, Andreas Eder wrote:

> I would write it without the second define using a named let:
>
> (define (range n)
> (let go ((n n) (a '()))
> (if (< n 0)
> a
> (go (1- n) (cons n a)))))

Looks good.

Using "do":

(define (range n)
(do ((i n (- i 1))
(a '() (cons i a)))
((< i 0) a)))

Using "unfold-right" in Gauche Scheme:

(use srfi-1)

Gauche doesn't have "1-".

(define (1- n) (- n 1))

(define (range n) (unfold-right negative? values 1- n))

(range 9)
===>
(0 1 2 3 4 5 6 7 8 9)

BOFH excuse #299: The data on your hard drive is out of balance.

comp / comp.lang.scheme / Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought

Subject	Author
(Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	HenHanna
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Lawrence D'Oliveiro
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Paul Rubin
Re: Parenthesis Pileup (was Re: (Mastermind) puzzle (with 3 digits) -- ...)	Lawrence D'Oliveiro
Re: Parenthesis Pileup (was Re: (Mastermind) puzzle (with 3 digits) -- ...)	Kaz Kylheku
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Kaz Kylheku
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Paul Rubin
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Paul Rubin
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Lawrence D'Oliveiro
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Paul Rubin
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Lawrence D'Oliveiro
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	George Neuner
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Paul Rubin
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Lawrence D'Oliveiro
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Paul Rubin
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Lawrence D'Oliveiro
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Paul Rubin
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Lawrence D'Oliveiro
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Paul Rubin
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Kaz Kylheku
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Nuno Silva
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Lawrence D'Oliveiro
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	HenHanna
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Lawrence D'Oliveiro
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	HenHanna
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Lawrence D'Oliveiro
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Andreas Eder
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Paul Rubin
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Lawrence D'Oliveiro
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	George Neuner
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	Paul Rubin
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	George Neuner
Re: (Mastermind) puzzle (with 3 digits) -- Elegant (readable) code Sought	B. Pym