Get Column names from csv data using D3

columns.js

/*
  As you read the data, use Object.keys() method to extract the column names. Might be useful for binding dropdowns.
*/

var columns=null;
d3.csv('nutdata.csv').row(function(row){
    if(columns==null){
        columns=Object.keys(row);
        columns=columns.slice(2,48); //Optional - to remove columns you dont need
    }
    return {"name":row.Shrt_Desc}; // Do data manipulation here
     
})
.get(function(error,data){
    console.log("Finished Getting Data");
});