StratoDempandas-js
Pandas for JavaScript
pandas.js is an open source (experimental) library mimicking the
Python pandas library. It relies on
Immutable.js as the
NumPy base. The main data
objects in pandas.js are the Series and the
DataFrame
Documentation
See the docs
See also this post on use for optimizing React logic.
Installation and use
$ npm install pandas-jsImporting
Series
and
DataFrame
import { Series, DataFrame } from 'pandas-js';Create a new Series
const ds = new Series([1, 2, 3, 4], {name: 'My test name', index: [2, 3, 4, 5]})
ds.toString()
// Returns:
// 2 1
// 3 2
// 4 3
// 5 4
// Name: My test name, dtype: dtype(int)Filter a Series
const ds = new Series([1, 2, 3]);
// Returns Series([2, 3]);
ds.filter(ds.gte(2));Filtering can be done with generic methods
const ds = new Series([1, 2, 3], {name: 'Test name'})
// Returns Series([true, false, false])
ds.eq(1);
// Returns Series([false, true, true])
ds.eq(new Series([0, 2, 3]));
// Returns Series([false, true, true])
ds.eq(Immutable.List([0, 2, 3]));
// Returns Series([false, true, true])
ds.eq([0, 2, 3]);
// Returns Series([2, 3])
ds.filter(ds.eq([0, 2, 3]));Create a new DataFrame
const df = new DataFrame([{x: 1, y: 2}, {x: 2, y: 3}, {x: 3, y: 4}])
// Returns:
// x | y
// 0 1 | 2
// 1 2 | 3
// 2 3 | 4
df.toString();Filtering a DataFrame
const df = new DataFrame(Immutable.Map({x: new Series([1, 2]), y: new Series([2, 3])}));
// Returns DataFrame(Immutable.Map({x: Series([2]), y: Series([3]));
df.filter(df.get('x').gt(1));
// Returns DataFrame(Immutable.Map({x: Series([2]), y: Series([3]));
df.filter([false, true]);
// Returns DataFrame(Immutable.Map({x: Series([2]), y: Series([3]));
df.filter(Immutable.Map([false, true]));Development
Testing and build
$ npm run test
$ npm run buildTesting uses Jest. Building requires the babel compiler.