Javascript: Object Model Dynamic Value at runtime

Question

I wish to add an object model to a Google chart dynamically at runtime. I call a php function using AJAX to get the data and based on the number of columns, I wish to make the last column a line chart.

I wish to replace 5 by c as per below script.

c = data.getNumberOfColumns()-2
var options = { 
 width: 400, 
 height: 240, 
 seriesType: "bars", 
 series: {5: {type: "line"}}, 
 };

Answer 1

c = data.getNumberOfColumns()-2;
var options = { 
 width: 400, 
 height: 240, 
 seriesType: "bars", 
 series: {}
 };
 options.series[c] = {type: "line"};