Keep latest events

When add or remove events can be received out of order, but we are only interested in the latest event that occured for a given id.

Example:

var latest = latestEvents();

// first
latest.process({ action: 'remove', id: 1, date: secondDate });

// then later
latest.process({ action: 'add', id: 1, date: firstDate });
latest.process({ action: 'add', id: 2, date: secondDate });

latest();
// [{ action: 'add', id: 2, date: secondDate }]
// does not contain event with `id == 1` as `remove` has a later date.

date is anything that can be handled by Date.parse.

We can also process arrays:

var latest = latestEvents();

var events = [
    { action: 'add', id: 1, date: firstDate },
    { action: 'remove', id: 1, date: secondDate },
    { action: 'add', id: 2, date: secondDate }
];

latest.process(events);
latest.process({ action: 'add', id: 3, date: thirdDate });

latest();
// [
//   { action: 'add', id: 2, date: secondDate },
//   { action: 'add', id: 3, date: thirdDate }
// ]

Install

npm:

$ npm install --save latest-events

Bower:

$ bower install --save latest-events

Manually: download file