D3 How to access data of an object in function

Question

My goal is to access the datas for a diagramm via a function out of an object.

I saved the object in aa variable: countries .

Object {Belgium: Array[5], Bulgaria: Array[5], Denmark: Array[5], Germany: Array[5]…}

Belgium : Array[5]
0 : 7030385
1 : 7455142
2 : 7545539
3 : 7644818
4 : 8002186

I want to access the data via a function. But somewhere is a mistake. The diagram is always empty

var diagram = svg.selectAll("circle").data(countries).enter().append("circle")
  .attr("cx", function(d,i){ return x(years[i]); })
  .attr("cy", function(d,i){ return y(d.Belgium[i]); })
  .attr("r", 2);
})

Answer 1

I fixed it now. Was as i thought just a little switch in the code ...

var diagram = svg.selectAll("circle").data(countries[Belgium]).enter().append("circle")
  .attr("cx", function(d,i){ return x(years[i]); })
  .attr("cy", function(d,i){ return y(d); })
  .attr("r", 2);
})