javascript - Nodejs retrieve a variable -

i retrieve variable "users" outside function:

    var users;      client.lrange("comptes", 0, -1, function(err, replies) {      replies.foreach(function(reply, i) {       users = json.parse(reply.tostring());     }); });  // here retrieve "users" variable console.log(users); // = undefined  function findbyid(id, fn) {   var idx = id - 1;   if (users[idx]) {     fn(null, users[idx]);   } else {     fn(new error('user ' + id + ' not exist'));   } }  function findbyusername(username, fn) {   (var = 0, len = users.length; < len; i++) {     var user = users[i];     if (user.username === username) {       return fn(null, user);     }   }   return fn(null, null); } 

i use q or async module, not know how it..

thanks .

the variable in scope of use have, means can undefined if you've never given value (which don't if don't count callback). try using line var users = "damn not yet"; , that's you'll in console. means callback function lrange either isn't being called, or logic wrong.