The problem is that interally,
"$i\n" becomes
$i . "\n" - which demonstrates why the problem occurs. You have to interpolate the value beforehand:
for (my $i = 0; $i<3; $i++) {
my $str = "$i\n";
push @d, sub { print $str };
}
However, that will not work correctly:
0
1
2
Oops. You meant
for (my $i = 1; $i<=3; $i++) {
my $str = "$i\n";
push @d, sub { print $str };
}
Because of this sort of problems, you should use the
for(LIST) form.
for my $i (1..3) {
my $str = "$i\n";
push @d, sub { print $str };
}
That eliminates an entire class of mistakes known as "fencepost errors", where the loop limit condition is fudged, usually resulting in one-off errors (one iteration too many or too few).
Makeshifts last the longest.
-
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.