Javascript Lambda Expressions - http://www.paulfree.com/11/javascript-lambda-expressions/

lambda.js

function lambda( l ) {
   var fn = l.match(/\((.*)\)\s*=>\s*(.*)/) ;
   var p = [] ;
   var b = "" ;
 
   if ( fn.length > 0 ) fn.shift() ;
   if ( fn.length > 0 ) b = fn.pop() ;
   if ( fn.length > 0 ) p = fn.pop()
    .replace(/^\s*|\s(?=\s)|\s*$|,/g, '').split(' ') ;
 
   // prepend a return if not already there.
   fn = ( ( ! /\s*return\s+/.test( b ) ) ? "return " : "" ) + b ;   
 
   p.push( fn ) ;
 
   try {
      return Function.apply( {}, p ) ;
   }
   catch(e) {
        return null ;
   }
}