If you want to omit characters, you can write 
my %hash = map $_=>1, qw(shave the modern way);

[download]

Interestingly, you can't. If you want to remove the block you need to have 

map +($_ => 1), ...

[download]
as => is a comma, so what you actually wrote is equivalent to these two statements below. 
my %hash = map $_, 1, qw(shave the modern way);
my %hash = map { $_ } 1, qw(shave the modern way);

[download]

(If you write map ($_ => 1), LIST the "function rule" kicks in and it becomes map($_ => 1), LIST i.e. (map $_, 1), LIST.)

This means that you can write 

map f($_) => LIST

[download]
which one could read declaratively as "map the function f onto the list I'm pointing at". Personally though I usually think of map as acting in the other direction, "shifting" of one element at a time from the list.

lodin

In reply to Re^6: Effeciency of key-only hash (map EXPR => LIST) by lodin
in thread Effecicncy of key-only hash by brycen

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.