Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

If you call the thing "$c_ref" then sure, it did not give you any advantage over the ill-named keyword. If on the other hand you use a descriptive name, the code gets must more readable. The Ruby syntax gives you no hint about what is the block supposed to do, what is it supposed to accept or return, it doesn't tell you anything! On one side you hear rubystas babble about how bad the Perl default variable $_ is and then they use something like this for something conceptually much more complicated and give you no chance to name the thing should you feel the need to. Perl let's you write foreach (@array) as well as foreach my $meaningful_name (@array), Ruby doesn't give you a chance to name the coderef/closure. It doesn't even admit there's one. To make things even funnier, it doesn't even tell you the method accepts a coderef (or block if you will) and the only way to find out is to read the method's body. The (&) at least tells you the subroutine expects a block, Ruby doesn't tell you anything.

If you do not want to name the coderef, go ahead an use $_[-1]->(1), it's just as cryptic as yield.

BTW, please translate these two to Ruby:

sub search { my $wanted = shift; foreach my $path (@_) { print "Searching in '$path'\n"; find($wanted, $path); } } # I don't care about the File::Find ... how do you pass the block to a +nother subroutine/method?
sub walk_tree { my ($self, $branch_handler, $leaf_handler) = @_; if ($self->isLeaf()) { $leaf_handler->($self->{data}); } else { $branch_handler->{$self->{data}}; foreach my $child ($self->children()) { $child->walk_tree($branch_handler, $leaf_handler); } } }

Now how big is the leap from a single block to multiple in Perl and in Ruby? How hard is it to do something nontrivial in Perl and in Ruby? Ruby's syntax makes simple things short and awkward and hard things next to impossible.

Enoch was right!
Enjoy the last years of Rome.

In reply to Re^3: RFC: Simulating Ruby's "yield" and "blocks" in Perl by Jenda
in thread RFC: Simulating Ruby's "yield" and "blocks" in Perl by LanX

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?

What's my password?
Create A New User
Domain Nodelet?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others chanting in the Monastery: (3)
As of 2023-09-25 22:37 GMT
Find Nodes?
    Voting Booth?

    No recent polls found