最近Stack Overflow上有一群讨厌perl的人，所以我想我应该把我的“关于你最喜欢的语言你讨厌的五件事”的问题带到Stack Overflow上。拿你最喜欢的语言来说，告诉我你讨厌它的五件事。这些可能只是让你烦恼的事情，承认的设计缺陷，公认的性能问题，或任何其他类别。你只需要讨厌它，它必须是你最喜欢的语言。
不要拿它和其他语言比较，也不要谈论你已经讨厌的语言。不要用你最喜欢的语言谈论你喜欢的事情。我只是想听到你讨厌但能容忍的东西，这样你就可以使用所有其他的东西，我想听到你希望别人使用的语言。
每当有人试图把他们最喜欢的语言强加给我时，我就会问这个问题，有时是面试问题。如果有人找不出他最喜欢的工具的5个缺点，那他对它还不够了解，不能提倡它，也不能利用它赚大钱。他还没有在足够多的不同情况下使用它来充分探索它。他把它作为一种文化或宗教来倡导，这意味着如果我不选择他最喜欢的技术，我就错了。
我不在乎你用什么语言。不想使用特定的语言?那就不要。你通过尽职调查做出了明智的选择，但仍然没有使用它?好吧。有时正确的答案是“你有一个强大的编程团队，有良好的实践和丰富的Bar经验。改成Foo是愚蠢的。”
This is a good question for code reviews too. People who really know a codebase will have all sorts of suggestions for it, and those who don't know it so well have non-specific complaints. I ask things like "If you could start over on this project, what would you do differently?" In this fantasy land, users and programmers get to complain about anything and everything they don't like. "I want a better interface", "I want to separate the model from the view", "I'd use this module instead of this other one", "I'd rename this set of methods", or whatever they really don't like about the current situation. That's how I get a handle on how much a particular developer knows about the codebase. It's also a clue about how much of the programmer's ego is tied up in what he's telling me.
憎恨并不是衡量人们了解多少的唯一尺度，但我发现它是一个相当不错的尺度。他们讨厌的事情也让我知道他们对这个话题的思考有多好。
Perl
Mixed use of sigils
my @array = ( 1, 2, 3 );
my $array = [ 4, 5, 6 ];
my $one = $array[0]; # not @array[0], you would get the length instead
my $four = $array->[0]; # definitely not $array[0]
my( $two, $three ) = @array[1,2];
my( $five, $six ) = @$array[1,2]; # coerce to array first
my $length_a = @array;
my $length_s = @$array;
my $ref_a = \@array;
my $ref_s = $array;
For example none of these are the same:
$array[0] # First element of @array
@array[0] # Slice of only the First element of @array
%array[0] # Syntax error
$array->[0] # First element of an array referenced by $array
@array->[0] # Deprecated first element of @array
%array->[0] # Invalid reference
$array{0} # Element of %array referenced by string '0'
@array{0} # Slice of only one element of %array referenced by string '0'
%array{0} # Syntax error
$array->{0} # Element of a hash referenced by $array
@array->{0} # Invalid reference
%array->{0} # Deprecated Element of %array referenced by string '0'
In Perl6 it is written:
my @array = ( 1, 2, 3 );
my $array = [ 4, 5, 6 ];
my $one = @array[0];
my $four = $array[0]; # $array.[0]
my( $two, $three ) = @array[1,2];
my( $five, $six ) = $array[1,2];
my $length_a = @array.length;
my $length_s = $array.length;
my $ref_a = @array;
my $ref_s = $array;
Lack of true OO
package my_object;
# fake constructor
sub new{ bless {}, $_[0] }
# fake properties/attributes
sub var_a{
my $self = shift @_;
$self->{'var_a'} = $_[0] if @_;
$self->{'var_a'}
}
In Perl6 it is written:
class Dog is Mammal {
has $.name = "fido";
has $.tail is rw;
has @.legs;
has $!brain;
method doit ($a, $b, $c) { ... }
...
}
Poorly designed regex features
/(?=regexp)/; # look ahead
/(?<=fixed-regexp)/; # look behind
/(?!regexp)/; # negative look ahead
/(?<!fixed-regexp)/; # negative look behind
/(?>regexp)/; # independent sub expression
/(capture)/; # simple capture
/(?:don't capture)/; # non-capturing group
/(?<name>regexp)/; # named capture
/[A-Z]/; # character class
/[^A-Z]/; # inverted character class
# '-' would have to be the first or last element in
# the character class to include it in the match
# without escaping it
/(?(condition)yes-regexp)/;
/(?(condition)yes-regexp|no-regexp)/;
/\b\s*\b/; # almost matches Perl6's <ws>
/(?{ print "hi\n" })/; # run perl code
In Perl6 it is written:
/ <?before pattern> /; # lookahead
/ <?after pattern> /; # lookbehind
/ regexp :: pattern /; # backtracking control
/ ( capture ) /; # simple capture
/ $<name>=[ regexp ] /; # named capture
/ [ don't capture ] /; # non-capturing group
/ <[A..Z]> /; # character class
/ <-[A..Z]> /; # inverted character class
# you don't generally use '.' in a character class anyway
/ <ws> /; # Smart whitespace match
/ { say 'hi' } /; # run perl code
Lack of multiple dispatch
sub f( int $i ){ ... } # err
sub f( float $i ){ ... } # err
sub f($){ ... } # occasionally useful
In Perl6 it is written:
multi sub f( int $i ){ ... }
multi sub f( num $i ){ ... }
multi sub f( $i where $i == 0 ){ ... }
multi sub f( $i ){ ... } # everything else
Poor Operator overloading
package my_object;
use overload
'+' => \&add,
...
;
In Perl6 it is written:
multi sub infix:<+> (Us $us, Them $them) |
(Them $them, Us $us) { ... }
Python:
1) It's a scripting language and not a fully compiled one (I'd prefer to be able to compile binaries—I don't care about bytecode). This is very annoying if I have to use very many libraries (i.e. everyone who uses my program has to install all the libraries, and this basically means no normal people will be able to, or have the patience to, properly set it up—unless I do a ton of work that should be unnecessary). I know ways to make binaries, but they don't always work, and I'm guessing they bundle the interpreter in the binaries anyhow (and I don't want that). Now, if I could get a bytecode compiler that would include copies of all the files that I imported (and only those) to be placed in my program's folder, that might be a suitable compromise (then no one would have to download extra libraries and such). It would also be nice if the compiled python files could be compressed into a single file with one specified as the file to run the program before this is done.
2)有时看起来有点bug;有几次，应该工作的代码根本没有工作(没有程序员错误)，特别是与“from moduleX import *”和其他导入相关的问题有关的代码，以及一些与全局和局部变量有关的问题。
3)最大递归深度可以更高。至少有一次，我觉得我需要它去更高的地方。
4)没有switch语句(更不用说允许数字、字符串和范围的语句)
5)新版本的Python似乎取消了很多有用的字符串操作，而且似乎没有简单的文档说明如何在没有它们的情况下做同样的事情。
6)强制自动垃圾收集(我希望能够手动执行，尽管不一定强制执行)。
7)没有预先制作的定时器类没有使用GUI(好吧，可能有一个，但在我所做的所有搜索之后，它肯定不方便找到!我确实找到了一些东西，但当我尝试时，它根本不起作用。)所谓计时器，我指的是每隔x秒执行一个指定函数的排序，并能在需要时关闭它，等等。
8)社区里举例的人很少告诉我们他们导入了哪些模块，以及他们是如何导入的。
9)与Lua集成的支持并不多。
10)似乎没有办法向一个类的特定实例(而不是整个类)添加一个额外的函数，除非你动态地向该类添加一个对象变量，该对象具有所需的函数(但仍然，你必须为此创建另一个类)。
