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Search and don\'t replace

/ Published in: JavaScript
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two awesome bits: using ''.replace() perform an action (other than replacing it) on some text, and a simple way to concatenate strings with a separator (retardedly simple but it always confuses me)

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  1. var q = 'foo=1&blah=a&foo=2&foo=3&blah=b'
  2.  
  3. function compress(data){
  4.     var q = {}, ret = '';
  5.     data.replace(/([^=&]+)=([^&]*)/g, function(m, key, value){
  6.         q[key] = (q[key] ? q[key] + ',' : '') + value;
  7.     });
  8.     for ( var key in q )
  9.         ret = (ret ? ret + '&' : '') + key + '=' + q[key];
  10.     return ret;
  11. }
  12.  
  13. console.log(compress(q))

URL: http://ejohn.org/blog/search-and-dont-replace/

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