The answer is in the docs for map: perldoc -f map. 

 "{" starts both hash references and blocks, so "map { ..." could 
 be either the start of map BLOCK LIST or map EXPR, LIST. Because
 perl doesn’t look ahead for the closing "}" it has to take a guess
 at which its dealing with based what it finds just after the "{".
 Usually it gets it right, but if it doesn’t it won’t realize
 something is wrong until it gets to the "}" and encounters the
 missing (or unexpected) comma. The syntax error will be reported
 close to the "}" but you’ll need to change something near the "{"
 such as using a unary "+" to give perl some help ...
The docs then list some examples, i prefer the syntax BrowserUk replied with, myself. You can also use parens, FWIW: 
%hash =  map (("$var/$_", $_), @array);

[download]

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)

In reply to Re: Using map to assign to a hash by jeffa
in thread Using map to assign to a hash by Anonymous Monk

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.