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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);
    var topData = R.compose(gloss, incomplete);
    var topDataAllUsers = R.compose(R.mapObj(gloss), activeByUser);
    var byUser = R.use(R.filter).over(R.propEq("username"));
    
    log("Gloss for Scott:");
    log(topData(byUser("Scott", tasks)));
    log("====================");
    log("Gloss for everyone:");
    log(topDataAllUsers(tasks));
}(ramda));