Mongodb Max Length MapReduce

gistfile1.js

reduce = function(key,vals) {
 return vals.sort(function(a,b){return b - a})[0]; 
}

map = function() {
 	var map_send = function(k,v) {
   	emit(k,v.toString().length);
 	} 
	
	var recursive_mapper = function(obj,level) { 
		level = level || 0;       
		for(key in obj) {
			if(level > 3) {
			 	return false;
			}
			var type = typeof(obj[key]);
			switch(type) {
				case 'string':
				case 'number':
					map_send(key,obj[key]);
					break;
				case 'object':
					level++;
					recursive_mapper(obj[key],level);
					break;
			}
		}
	}
	recursive_mapper(this);
}