Aggregating object values into new object using _.js

Question

Suppose I have an array

var i = [{event: 'create', date: '03/11'}, {event: 'delete', date: '03/11'}, {event: 'put', date: '05/11'}, {event: 'delete', date: '06/11'}]

And then reduce them into an object as such:

var reduced = {03/11: 2, 05/11: 1, 06/11: 1}

What would be the best way of aggregating these results using _.js that would produce an object:

result = {03/11: [{event: 'create', date: '03/11'}, {event: 'delete', date: '03/11'}],
05/11: [{event: 'put', date: '05/11'}], 06/11: [{event: 'delete', date: '06/11'}]}

Any help would be greatly appreciated

Evan Davis · Accepted Answer · 2014-03-06 20:46:33Z

2

This is the basic use case for _.groupBy.

var i = [{event: 'create', date: '03/11'}, {event: 'delete', date: '03/11'}, {event: 'put', date: '05/11'}, {event: 'delete', date: '06/11'}];

var result = _.groupBy(i, function(item) {
    return item.date;
});

Fiddle

answered Mar 6, 2014 at 20:46

Evan Davis

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