To elaborate on that second part...

When you say %hash = (a => "foo", b => "bar") perl treats the "=>" operator as a synonym for ",", so this really looks like %hash = (a,"foo",b,"bar"). Perl knows to treat a list assigned to a hash as key/value pairs, so this works right.

In your example, where you tried %hash = (a => (foo,bar, baz)), perl treats the right hand side as (a,(foo,bar,baz)), which is "flattened" into (a,foo,bar,baz), which is then assigned to %hash, yielding %hash{a} = "foo" and %hash{bar} = "baz", which isn't what you wanted.

The suggestions to use references will do what you want.

In reply to RE: Re: Using an array in a hash by BlaisePascal
in thread Using an array in 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.