Restful returns Undefined in JS Class

Question

I’m making changes to HTML after taking data from the Lastfm API, working with class in JS, making method calls within the class itself, where the date was called before, but this returns Undefined:

    class Tidal{
        constructor(ev){
            this.dom = ev;
            this.data = {};
            this.elements = {};

            this.getInfo();
            console.log(this)
        }

        getInfo(){
            var self = this.data;

            var lastfm = new LastFM({
              apiKey    : '929cfb240401e3f7c1c0cd531aa1939e',
              apiSecret : 'ac2ecff79d5881a1a8e810f249f052df'
            });

            lastfm.artist.getInfo({artist: 'Madeon'}, {success: function(data){
                self.artistInfo = data;
            }, error: function(code, message){
              console.log(code, message);
            }});

            console.log(self.artistInfo, 12345) // retorna undefined
        }
   }

However when called after the file is loaded in devtools the method works correctly.