|Perl: the Markov chain saw|
Re: Arrow Operator and questions related to Path::Classby kennethk (Abbot)
|on Sep 11, 2012 at 15:22 UTC||Need Help??|
Let's go line by through the code.
So, we'll use Path::Class. According to the linked docs, this use statement exports 2 functions: dir and file. So now we know anytime we see the function dir, we are invoking the one from Path::Class. From the docs:
dirSo the correct place to find docs on the object returned by dir is Path::Class::Dir. Let us continue:
Now we've invoked the method next via an arrow dereference, so we check the appropriate package for the object for the method documentation. If you didn't realize it what package it was, you can use ref to tell you via the debug statement print ref $dir;.
$dir_or_file = $dir->next()
So now we have either a Path::Class::Dir or a Path::Class::File, depending on what the iterator hit. In both cases, methods by the name of stringify and is_dir are available and documented in the appropriate docs. When you get to the line
next if $file->is_dir();
we see next is not associated with a object dereference, so unless Path::Class exports something by that name, it will be a Perl CORE function. So, if we check the docs, either via the web at next or on the command line via perldoc -f next, we see it's a language keyword for flow control.
This is all recoverable if you follow the logical flow of the program.
#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.