Beefy Boxes and Bandwidth Generously Provided by pair Networks
XP is just a number
 
PerlMonks  

Curious to know the internals of the following code

by jesuashok (Curate)
on Nov 08, 2005 at 07:18 UTC ( [id://506632]=perlquestion: print w/replies, xml ) Need Help??

jesuashok has asked for the wisdom of the Perl Monks concerning the following question:

This node falls below the community's threshold of quality. You may see it by logging in.

Replies are listed 'Best First'.
Re: Curious to know the internals of the following code
by BUU (Prior) on Nov 08, 2005 at 07:20 UTC
    The first time you assign to @list you use 'q' which is a pseudonym (or perhaps real name) for the '' operator. The second time you assign you use qw// which splits on spaces.
Re: Curious to know the internals of the following code
by jbrugger (Parson) on Nov 08, 2005 at 07:32 UTC
    A little bit of reading would have helped...
    It's all there: perlop
    # q/STRING/ # 'STRING' A single-quoted, literal string. A backslash represents a backslash un +less followed by the delimiter or another backslash, in which case th +e delimiter or backslash is interpolated. $foo = q!I said, "You said, 'She said it.'"!; $bar = q('This is it.'); $baz = '\n'; # a two-character string qw/STRING/ Evaluates to a list of the words extracted out of STRING, using embedd +ed whitespace as the word delimiters. It can be understood as being r +oughly equivalent to: split(' ', q/STRING/); the differences being that it generates a real list at compile time, a +nd in scalar context it returns the last element in the list. So this + expression: qw(foo bar baz) is semantically equivalent to the list: 'foo', 'bar', 'baz'
    "We all agree on the necessity of compromise. We just can't agree on when it's necessary to compromise." - Larry Wall.
Re: Curious to know the internals of the following code
by blazar (Canon) on Nov 08, 2005 at 10:57 UTC
    Because despite the name @list you're in fact assigning it a single element which is precisely the string "'Ashok Hello'", that is: without the external double quotes, but with the internal single ones. That is precisely the difference between q() and qw(): the former returns non interpolated strings, and when used with "'" (single quotes) as a delimiter "q" become redundant, while the latter returns a list of (non interpolated) "words"1, splitting on whitespace.

    1 Notice the double quotes - I mean that they're not required to match /^\w+$/.

Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: perlquestion [id://506632]
Approved by jbrugger
help
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others goofing around in the Monastery: (2)
As of 2024-03-19 07:04 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found