comment on

Hello monks. I have a question I'm sure has a very easy answer, but I'm not quite sure how to look for it.

I have a variable with some value in it. I would like to create an anonymous subroutine that will return the value of the variable. However, I'd like to lock in the return value of the subroutine to be the value of the variable when I create the subroutine as opposed to the current value of the variable when the subroutine is called. For example:

  DB<10> $str = 'hi';

  DB<11> $sub = sub {$str}

  DB<12> x &$sub
0  'hi'

  DB<13> $str = 'hello';

  DB<14> x &$sub
0  'hello'
[download]

I would like the second call to &$sub to return 'hi' also, instead of the new value of $str. How do I force the variable to be interpolated at the time of the subroutine creation? I tried double quoting the var but that didn't do the trick either. I tried searching a bit, but the terms to use for this aren't obvious and I'm not getting much for results.

I appreciate any input. I'm sure I'll be giving myself a good facepalming shortly after someone points out the obvious :)

In reply to simple anonymous subroutine and variable interpolation timing question by tj_thompson

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.


Do you know where your variables are?
	PerlMonks