Posted By

noah on 05/01/07

Tagged

closure unobtrusive counter flanagan oreilly rhino

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handcoding

Unique ID generator without a global temp variable

/ Published in: JavaScript

This is cool and simple example of a closure. It is from the Flanagan (Rhino) Javascript book, page 131 of the 5th edition.

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var uid = (
  function(){
    var id=0; 
    return function(){
      return id++ ;
    };
  } 
)();
//then just say:
alert(uid()); //alert 1
alert(uid()); //alert 2
alert(uid()); //etc.

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Posted By: SkewsMe on February 15, 2010

The first alert(uid()); will alert 0, then 1, 2, etc.

I use a modified version allowing me to reset the id back to zero.

var uid = (function(){var id=0;return function(){if(arguments[0]===0)id=0;return id++;}})();

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