7 ms·

What one can learn from Perl: When programming in a language you hate, don't take naming arguments for granted. It could be worse: you could be programming in

by PySlice 13y ago

What one can learn from Perl: When programming in a language you hate, don't take naming arguments for granted. It could be worse: you could be programming in Perl, where all arguments come in a flattened array.

kbenson 13y ago
This is really not much of an issue, if you bother to learn the language. If you don't, then yes, things will be confusing. sub named_params { my %P = @_; # named params in hash %P my $foo = $P{bar} + $P{baz}; return $foo * $P{multiplier}; } my $rvalue = named_params( foo => 1, bar => 2, multiplier => 3 ); Or, some people prefer to just pass in a hash reference: sub named_params_hashref { my $P = shift; my $foo = $P->{bar} + $P->{baz}; return $foo * $P->{multiplier}; } my $rvalue = named_params_hashref({ foo => 1, bar => 2, multiplier => 3, }); But of course, why bother letting common sense, and a single line of code stand in the way of your chance to deliver a pithy remark?
berntb 13y ago
"PySlice" with karma 25 is probably your trolling account. If not, ASK about stuff you have no clue about. It is better than looking like a little troll kid, having "fun" lowering the quality of HN by stupid language war comments. >>where all arguments come in a flattened array That is optional, through the power of CPAN (and kbenson's methods, of course). Examples of alternatives: http://search.cpan.org/~barefoot/Method-Signatures-20130222/lib/Method/Signatures.pm http://search.cpan.org/~barefoot/Method-Signatures-20130222/... http://search.cpan.org/~flora/MooseX-Declare-0.35/lib/MooseX/Declare.pm http://search.cpan.org/~flora/MooseX-Declare-0.35/lib/MooseX... http://search.cpan.org/~ether/MooseX-Method-Signatures-0.44/lib/MooseX/Method/Signatures.pm http://search.cpan.org/~ether/MooseX-Method-Signatures-0.44/... (Depending on if you use Moose or not.) One of the cool parts of Perl is that the language is extensible, that is why it e.g. has a better OO than Python, Ruby, etc. (Or simple typing of parameter arguments, see the modules above. Or why MooseX::Declare has ... ah, look yourself, troll.)
- nijk 13y ago
  "the" language is then more of a loosely couples family of languages.
  - berntb 13y ago
    Not half as much as any Lisp variant with good macros. Edit: The possibility to extend your environment is generally seen as a good thing, unless you believe in cleanliness of bloo... languages for ideological reasons.
tudorconstantin 13y ago
just like in javascript - oh wait, that is the shiny new trend in programming, there it can't be bad thing the lack of named params.
nijk 13y ago
That is a lie. Some of the arguments are provided as global variables like $_, (no need to remember its name, since its value will be implicitly used whenever you omit a necessary argument) whose value is decided by something akin to Clippy choosing what seems most handy.
- Mithaldu 13y ago
  $_ is very clearly and sharply defined. Only because you never took even a slightly look at the documentation does not mean you should just make up things. :)
- kbenson 13y ago
  $_ is not global, it's lexical. It's value is not haphazardly chosen, it is the topic for structures that topicalize. You seem to be proving what I said earlier[1]. You think you understand what's going on, but in truth you don't. Feel free to continue making assertions regarding things you don't know, I can't stop you, but be aware that to do so is dishonest. [1]: https://news.ycombinator.com/item?id=5657901 https://news.ycombinator.com/item?id=5657901

by PySlice 13y ago

kbenson 13y ago

This is really not much of an issue, if you bother to learn the language. If you don't, then yes, things will be confusing. sub named_params { my %P = @_; # named params in hash %P my $foo = $P{bar} + $P{baz}; return $foo * $P{multiplier}; } my $rvalue = named_params( foo => 1, bar => 2, multiplier => 3 ); Or, some people prefer to just pass in a hash reference: sub named_params_hashref { my $P = shift; my $foo = $P->{bar} + $P->{baz}; return $foo * $P->{multiplier}; } my $rvalue = named_params_hashref({ foo => 1, bar => 2, multiplier => 3, }); But of course, why bother letting common sense, and a single line of code stand in the way of your chance to deliver a pithy remark?

berntb 13y ago

"PySlice" with karma 25 is probably your trolling account. If not, ASK about stuff you have no clue about. It is better than looking like a little troll kid, having "fun" lowering the quality of HN by stupid language war comments. >>where all arguments come in a flattened array That is optional, through the power of CPAN (and kbenson's methods, of course). Examples of alternatives: http://search.cpan.org/~barefoot/Method-Signatures-20130222/lib/Method/Signatures.pm http://search.cpan.org/~barefoot/Method-Signatures-20130222/... http://search.cpan.org/~flora/MooseX-Declare-0.35/lib/MooseX/Declare.pm http://search.cpan.org/~flora/MooseX-Declare-0.35/lib/MooseX... http://search.cpan.org/~ether/MooseX-Method-Signatures-0.44/lib/MooseX/Method/Signatures.pm http://search.cpan.org/~ether/MooseX-Method-Signatures-0.44/... (Depending on if you use Moose or not.) One of the cool parts of Perl is that the language is extensible, that is why it e.g. has a better OO than Python, Ruby, etc. (Or simple typing of parameter arguments, see the modules above. Or why MooseX::Declare has ... ah, look yourself, troll.)

nijk 13y ago
"the" language is then more of a loosely couples family of languages.
- berntb 13y ago
  Not half as much as any Lisp variant with good macros. Edit: The possibility to extend your environment is generally seen as a good thing, unless you believe in cleanliness of bloo... languages for ideological reasons.

tudorconstantin 13y ago

just like in javascript - oh wait, that is the shiny new trend in programming, there it can't be bad thing the lack of named params.

nijk 13y ago

That is a lie. Some of the arguments are provided as global variables like $_, (no need to remember its name, since its value will be implicitly used whenever you omit a necessary argument) whose value is decided by something akin to Clippy choosing what seems most handy.

Mithaldu 13y ago
$_ is very clearly and sharply defined. Only because you never took even a slightly look at the documentation does not mean you should just make up things. :)
kbenson 13y ago
$_ is not global, it's lexical. It's value is not haphazardly chosen, it is the topic for structures that topicalize. You seem to be proving what I said earlier[1]. You think you understand what's going on, but in truth you don't. Feel free to continue making assertions regarding things you don't know, I can't stop you, but be aware that to do so is dishonest. [1]: https://news.ycombinator.com/item?id=5657901 https://news.ycombinator.com/item?id=5657901