phpsmarter

http://jsfiddle.net/CrossEye/Gk6uu/light/

(function(R) {
    var incomplete = R.filter(R.where({complete: false}));
    var sortByDate = R.sortBy(R.prop('dueDate'));
    var sortByDateDescend = R.compose(R.reverse, sortByDate);
    var importantFields = R.project(['title', 'dueDate']);
    var groupByUser = R.partition(R.prop('username'));
    var activeByUser = R.compose(groupByUser, incomplete);
    var gloss = R.compose(importantFields, R.take(5), sortByDateDescend);

phpsmarter

// @flow
import React from 'react';
import { render } from 'react-dom';

type Field = 0 | 1;

type Position = [Field, Field, Field, Field];

type Unit = [Position, Position, Position, Position];