Python Pandas equivalent in JavaScript

Question

With this CSV example:

   Source,col1,col2,col3
   foo,1,2,3
   bar,3,4,5

The standard method I use Pandas is this:

1. Parse CSV<

Answer 1

Here is an dynamic approach assuming an existing header on line 1. The csv is loaded with d3.js.

function csvToColumnArrays(csv) {

    var mainObj = {},
    header = Object.keys(csv[0]);

    for (var i = 0; i < header.length; i++) {

        mainObj[header[i]] = [];
    };

    csv.map(function(d) {

        for (key in mainObj) {
            mainObj[key].push(d[key])
        }

    });        

    return mainObj;

}


d3.csv(path, function(csv) {

    var df = csvToColumnArrays(csv);         

});

Then you are able to access each column of the data similar an R, python or Matlab dataframe with df.column_header[row_number].