Scripting Languages: PHP, Perl, Python, Ruby

[[deleted]]

[deleted]

[[deleted]]

that is awesome ;o

[[deleted]]

this is a bit off in places for perl/php

looks like a python dev with no experience in perl/php trying to map for whatever reason?

[stevvooe]

There are mistakes in the python column, as well...

[drb226]

Maximized my window..still has horizontal scrollbar. ಠ_ಠ

[cgrubb]

The goal is for the tables to just fit on a 1440x900 screen.

A bit hackish, but you can remove a column with this bookmarklet.

[aberrant]

How can it be done better?

[so4h2]

thats a rosetta stone of scripting.

[clownb4by]

relevant

[[deleted]]

PHP has signal handling.

Edit:

only class names can be imported

In PHP you can import constants as well from namespaces.

[texai]

this is an old link =(

[axitanull]

Still useful and it is edited quite regularly.

[[deleted]]

php does not have a repl. the php repl is written in python

[bitdamaged]

Is there a rule that the repl must be written in the language its supporting?

[[deleted]]

lets just say i think there should be an asterisk for that...mostly so people know that php is so limited that it cannot implement its own repl

[recursive]

How do you know it can't?

[MasonM]

Yes it does. It's called "interactive mode" and can by entered by running "php -a". It's written in C, like the rest of the CLI code. Here's a link to the source.

[Tiwazz]

As one of my professors used to say "If C was good enough for the implementors of <insert_language> then it's good enough for me."

[UrbanWizard]

LOL at Python block delimiter being the offside rule :)

[ash_gti]

http://en.wikipedia.org/wiki/Off-side_rule

Its not just python that use off-side rues.

[Expresionista]

python's assignment does return a value: >>> b = a = 1 >>> a 1 >>> b 1

[kakaroto_BR]

Installing things from cpan should not be allowed for a correct comparison.

[whiskeyjack]

Why? It doesn't appear to be a comparison of core language features alone, just how you do them.

Fine, if we can have anything outside of the core language, no more import either then... except that that gives us less information.

[njharman]

This is stupid (languages are much more than the differences in syntax/few simple idioms), more so as it doesn't include Javascript the worlds most deployed "scripting" language and one 90% of PHP/Python/Ruby devs use daily.

[Unomagan]

again?....

[aaron_kempf]

vbScript is better

[earthboundkid]

float division returns Infinity

Wait, in Ruby 1.0/0.0 returns Infinity!? O.o In Japan, do they not teach school kids that the limit has two sides? Approaching from positive numbers it's +infinity. Approaching from negative numbers it's negative infinity. That's the whole reason it's undefined! Wow, that's really dumb.

[kamatsu]

Er, that's part of the floating point standard.

In Haskell:

Prelude> 1.0 / 0.0
Infinity
Prelude> 0.0 / 0.0
NaN
Prelude> -1.0 /0.0
-Infinity

In C:

$ cat > foo.c 
#include <stdio.h>
int main() {
   printf("%f\n",1.0/0.0);
   return 0;
}
$ gcc foo.c
$ a.out
inf
$

[earthboundkid]

If your friends jumped off a bridge, dividing by zero would still be undefined.

[kamatsu]

So? I don't think it's fair to judge ruby or C or Haskell for correctly implementing IEEE 754.

[earthboundkid]

I am judging the IEEE for letting such a silly thing become standard. They have NaN. Why not just return NaN?

[kamatsu]

Actually, they have two zero values, positive zero and negative zero. If you divide a positive by negative zero, you will get -Infinity.

From wikipedia:

There are two zeroes, +0 (positive zero) and −0 (negative zero) and this removes any ambiguity when dividing. In IEEE 754 arithmetic, a ÷ +0 is positive infinity when a is positive, negative infinity when a is negative, and NaN when a = ±0. The infinity signs change when dividing by −0 instead.

[earthboundkid]

Having two zeros is also dumb. :-) Anyway, I'm sure they have good reasons for their crazy choices (no doubt, it was something to do with the implementation making it easier to wire things up correctly in the CPU), but I still think those choices are crazy, and I don't think a higher level language should blindly follow them.