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

I've been working on a data wrangling library for JavaScript called data-forge. It's inspired by LINQ and Pandas.

It can be installed like this:

npm install --save data-forge

Your example would work like this:

var csvData = "Source,col1,col2,col3\n" +
    "foo,1,2,3\n" +
    "bar,3,4,5\n";

var dataForge = require('data-forge');
var dataFrame = 
    dataForge.fromCSV(csvData)
        .parseInts([ "col1", "col2", "col3" ])
        ;

If your data was in a CSV file you could load it like this:

var dataFrame = dataForge.readFileSync(fileName)
    .parseCSV()
    .parseInts([ "col1", "col2", "col3" ])
    ;

You can use the select method to transform rows.

You can extract a column using getSeries then use the select method to transform values in that column.

You get your data back out of the data-frame like this:

var data = dataFrame.toArray();

To average a column:

 var avg = dataFrame.getSeries("col1").average();

There is much more you can do with this.

You can find more documentation on npm.