This is either "picky" or "iggerant" but the statement (above) that...
"You can also add elements anywhere in the array by just storing something at the new index."
... seems to me to be, at once, true, and "possibly confusing."
In short, I don't know any function that will add an element to an array at any arbitrary index nor any technique (aside from the one below) for doing so.
#!usr/perl/bin
use strict;
use warnings;
use Data::Dumper;
my $file0 = "foo.txt";
my $file1 = "bar.txt";
my $file2 = "blivitz.txt";
my @array1 = ($file0, $file1, $file2);
print "Initial array:\n";
my $elementindex = 0;
for my $file(@array1) {
print "\$elementindex $elementindex is $file\n";
$elementindex++;
}
print "\n";
# Now adding an interior element to the array, in this case, arbitrari
+ly inserting "new element"
# after "foo.txt" and before "bar.txt"
#(to add to beginning or end, see push and unshift)
my @temp_array = @array1; # copy all elements to new array
@temp_array = ($array1[0], "new element", $array1[1], $array1[2]);
@array1 = @temp_array; # copy revisions back to @array1
$elementindex = 0;
for my $file(@array1) {
print "After revisions, \$elementindex $elementindex is $file\n";
$elementindex++;
}
print "\n";
# This REPLACES the latest content of $array1[1], "new element", with
+$addelement.txt
# BUT note it's NOT "add"(ing) an element "anywhere"
my $addelement = "addelement.txt";
$array1[1] = $addelement; #
$elementindex = 0;
for my $file(@array1) {
print "now \$elementindex $elementindex is $file\n";
$elementindex++;
}
Output:
$elementindex 0 is foo.txt
$elementindex 1 is bar.txt
$elementindex 2 is blivitz.txt
After revisions, $elementindex 0 is foo.txt
After revisions, $elementindex 1 is new element
After revisions, $elementindex 2 is bar.txt
After revisions, $elementindex 3 is blivitz.txt
now $elementindex 0 is foo.txt
now $elementindex 1 is addelement.txt
now $elementindex 2 is bar.txt
now $elementindex 3 is blivitz.txt
Perhaps splice() ( perldoc -f splice ) is also an option but thus far /me does not see how to implement it.
-
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.