There's a pretty common pattern for solving this, and it looks like this: 

for (@arr1) {  #for each element in @arr1
    s/\s+$//;  #replace one or more spaces at the end of it
               #with nothing (deleting them)
}

[download]

You'll commonly see the regular expression s/^\s+|\s+$//g as well -- which basically says "match any whitespace at the beginning or end of the string, and remove all of it".

The shorter versions you see near the top of this discussion are simply shorter ways to write this pattern. In Perl, there's always more than one way to do things. To demonstrate that, here's another solution that would work (but I don't recommend): 

for (@arr1) {
    while ( substr($_,-1,1) eq ' ' ) {  # while the last char is space
       chop();                          # remove the last char
    }
}

[download]

Or, the shorter version: 

for (@arr1) { chop() while substr($_,-1,1) eq ' ' }

[download]
<–radiant.matrix–>
Ramblings and references
The Code that can be seen is not the true Code
I haven't found a problem yet that can't be solved by a well-placed trebuchet

In reply to Re: How to delete trailing spaces from array elements? by radiantmatrix
in thread How to delete trailing spaces from array elements? by rcu

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.