lang comparison: in-place algorithm for reversing a list in Perl,Python, Lisp
xahlee at gmail.com
Thu Mar 1 23:04:10 CET 2012
On Mar 1, 7:04 am, Kaz Kylheku <k... at kylheku.com> wrote:
(floor (/ x y)) --[rewrite]--> (floor x y)
Thanks for this interesting point.
I don't think it's a good lang design, more of a lang quirk.
similarly, in Python 2.x,
will work when both x and y are integers. Also,
works too, but that // is just perlish unreadable syntax quirk.
similarly, in perl, either one
require POSIX; floor(x/y);
the require POSIX instead of Math is a quirk. But even, floor should
really be builtin.
using a perl hack
all of the above are quirks. They rely on computer engineering by-
products (such as int), or rely on the lang's idiosyncrasy. One easy
way to measure it is whether a programer can read and understand a
program without having to delve into its idiosyncrasies. Problem with
these lang idioms is that it's harder to understand, and whatever
advantage/optimization they provide is microscopic and temporary.
best is really floor(x/y).
idiomatic programing, is a bad thing. It was spread by perl, of
course, in the 1990s. Idiomatic lang, i.e. lang with huge number of
bizarre idioms, such as perl, is the worst.
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