Sort of like your slice, but you also can provide default values if things are missing. E.g. if arg_map didn't have anything at the key :foo the variable foo would get be the string "foo missing". 

(let [{:keys [foo bar] :or {foo "foo missing"}} arg_map]
  ;; ...
)

[download]

You'd prossibly need something like my $foo = exists $arg_map{foo} ? $arg_map{foo} : "foo missing" and you'd need to do each variable separately. (I've not messed with clojure in long enough that I'm probably explaining this poorly, to boot . . .)

The cake is a lie.
The cake is a lie.
The cake is a lie.

In reply to Re^3: RFC: Destructuring Assignment (aka Unpacking aka Type Patterns) in pure Perl by Fletch
in thread RFC: Destructuring Assignment (aka Unpacking aka Type Patterns) in pure Perl by LanX

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.