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XML-escape given string

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LICENSE.txt
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Copyright (c) 2011 YOUR_NAME_HERE, YOUR_URL_HERE
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
README.md
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140byt.es

A tweet-sized, fork-to-play, community-curated collection of JavaScript.

How to play

  1. Click the Fork button above to fork this gist.
  2. Modify all the files to according to the rules below.
  3. Save your entry and tweet it up!

Keep in mind that thanks to the awesome sensibilities of the GitHub team, gists are just repos. So feel free to clone yours and work locally for a more comfortable environment, and to allow commit messages.

Rules

All entries must exist in an index.js file, whose contents are

  1. a valid Javascript function expression, that
  2. optionally self-executes,
  3. contains no more than 140 bytes, and
  4. does not pollute global scope.

All entries must also be licensed under the MIT license.

For more information

The 140byt.es site hasn't launched yet, but for now follow @140bytes on Twitter.

To learn about byte-saving hacks for your own code, or to contribute what you've learned, head to the wiki.

140byt.es is brought to you by Jed Schmidt. It was inspired by work from Thomas Fuchs and Dustin Diaz.

annotated.js
JavaScript
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function(){
/* Rules:
(1) anonymous function // make sure
(2) may be self-executing // to annotate
(3) <=140 bytes // your code
(4) no globals // so everyone
(5) MIT license // can learn
(6) have a good time! // from it!
*/}
package.json
JSON
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{
// [REQUIRED] A name for your library.
// This must match /^[a-z_]\w*$/i
"name": "140bytes",
 
// [OPTIONAL] A description of your library, phrased as a verb predicate.
// The gist description is used by default.
"description": "Explain the 140byt.es rules.",
 
// [OPTIONAL] Up to 5 keywords used for indexing.
"keywords": [
"140bytes",
"master",
"rules"
]
}

You can leave out the brackets in the regexp - the first callback parameter is always the full match.

Regards, LX

@atx: Must be a vestige of a prior implementation. Shaved two more bytes. Thanks!

&#34; is a shorter way of saying &quot;, and &#37; is a shorter way of saying &apos;.

// original: 124 bytes
function(s){return s.replace(/[&<>'"]/g,function(c){return "&"+{"&":"amp","<":"lt",">":"gt","'":"apos",'"':"quot"}[c]+";"})}
// 122 bytes
function(s){return s.replace(/[&<>'"]/g,function(c){return "&"+{"&":"amp","<":"lt",">":"gt","'":"#37",'"':"#34"}[c]+";"})}

Also, if IE < 9 support is not an issue, this could be shortened even more by using the new Option(html).innerHTML trick to escape HTML.

// 87 bytes, but doesn’t work in IE < 9
function(s){return new Option(s).innerHTML.replace(/"/g,'&#34;').replace(/'/g,'&#37;')}

Even shorter:

// 56 bytes
function(s){return new Audio(s).outerHTML.slice(27,-10)}

@eligrey: Wow! Hax!

Same char len (56), a different take:

function(s){return new Audio(s).outerHTML.split('"')[3]}

@atesgoral and @eligrey, those last two versions don’t escape single quotes though, so you’d still need .replace(/'/g,'&#37;').

// 78 bytes, but doesn’t work in IE < 9
function(s){return new Audio(s).outerHTML.slice(27,-10).replace(/'/g,'&#37;')}

While Option is available even in IE6, Audio is not even present in IE8.

@atk

While Option is available even in IE6 […]

It is available in IE6 but it doesn’t work the way it’s being used here.

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