needlessly convoluted.js

Array.prototype.unique = function(a){
  return function(){
    return this.filter(a)
  }
}(function(a,b,c){
  return c.indexOf(a,b+1)<0
});

Array.prototype.unique = function() {
  return this.filter(function(a,b,c) {
    return c.indexOf(a,b+1) < 0;
  });
};