add(2)(3)(4) with add(2,3,4)

function add(){
   let args = [].slice.apply(arguments);
   function resultFn(){
      args = args.concat([].slice.apply(arguments));
      
      if(args.length>=3){
        return args.slice(0,3).reduce(function(acc,next){ return acc+next},0)
      }
      
      return resultFn
   }
   
   return resultFn();
}