Fear my metaprogramming sk1llz

gistfile1.js

var sys = require('sys');

var l = [
    { unread: 4, sub: 1 },
    { unread: 0, sub: 1 },
    { unread: 4, sub: 0 }
];  
    
filters = process.env.filter; if (filters == undefined) { filters = ""; }

a = ['true'];
        
if (filters.match(/\bsub\b/)) { a.push("d.sub"); }
if (filters.match(/\bunread\b/)) { a.push("d.unread > 0"); }
    
b = "g=function(a,f,d,c){if("+a.join(' && ')+"){c(true,d);}else{c(false,undefine
d);}}";
eval(b);

for(var x in l) {
    g(1,1,l[x],function(t,d){sys.puts(t+" "+sys.inspect(d))});
}