The best way to do this is via a hash slice.

In the first example the hash values will all be undef*. To assign a value to all the keys you can use the second method: 

    my @a = (1..9);
    my %h;

    # hash slice
    @h{@a} = ();

    # Same thing but sets each value to 1
    @h{@a} = (1) x @a;

[download]

Hash, and array, slices are explained in perldata.

--
John.

* It is worth noting that the assignment in the first example is only to the hash value associated with the first element of the array.

In reply to Re: converting ana array to a hash by jmcnamara
in thread converting ana array to a hash by hotshot

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.