javascript - Making recursive function -

i'd make object likes

obj = {2 : {3 : {4 : { } } } }

function tsttt (){   var tstobj = {};   var cntr = 0;    //counter   var key = [2,3,4];   ///keys array want put in object    function re(obj){     var k = key[cntr];     if(cntr == 2){       return obj;     }else if(!(k in obj)){       obj[k] = {};     }     cntr++;     return re(obj[k]);   }   var rslt = re(tstobj);   logger.log(rslt); //google apps script log } 

it returns empty object {}

it's returning last object created, or property assigned "3". if want return full object have return tstobj.

  function re(obj){     var k = key[cntr];     if(cntr == 2){       return tstobj;     }else if(!(k in obj)){       obj[k] = {};     }     cntr++;     return re(obj[k]);   }