function getOnlineGamers(){
      var online_gamers = [];
        for (var i=0; i<gamers.length; i++){
                     //(gamers is a defined array with 11names of 11gamers.)

          $.getJSON(url+"streams/"+ gamers[i]+cid).done(function(data){
             if(data.stream === null){
              }else {
                 var name= data.stream.channel.name;
                 online_gamers.push(name);
                     }
                 console.log(online_gamers);  // <--- A
               });
              };
            console.log(online_gamers); //<--- B
           };

  console.log(getOnlineGamers())