Run results for: simple stuffddd x2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.125 Safari/537.36

Browser: Chrome 84

Operating system: Mac OS X 10.15.5

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Lodash	97.5 Ops/sec
Native	96.6 Ops/sec
Lodash with defined group	3015.1 Ops/sec
Naive date grabbing	2699.5 Ops/sec

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.0/moment.min.js'></script>

Script Preparation code:

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var data = dates.map((start, i) => ({ start, id: i, duration: i % 4, groupDay: moment(start).format('YYYY-MM-DD') }))
data = data.reduce((acc, te) => { acc[te.id] = te; return acc; }, {})

Tests:

Lodash
_.chain(data) .map(timeEntry => timeEntry) .sortBy('start') .reverse() .filter(timeEntry => timeEntry.duration >= 0) .groupBy(timeEntry => moment(timeEntry.start).format('YYYY-MM-DD')) .value()
Native
Object.values(data) .filter(timeEntry => timeEntry.duration >= 0) .sort((a, b) => a.start.localeCompare(b.start)) .reverse() .reduce((acc, timeEntry) => { const key = moment(timeEntry.start).format('YYYY-MM-DD') ;(acc[key] || (acc[key] = [])).push(timeEntry) return acc }, {})
Lodash with defined group
_.chain(data) .map(timeEntry => timeEntry) .sortBy('start') .reverse() .filter(timeEntry => timeEntry.duration >= 0) .groupBy(timeEntry => timeEntry.groupDay) .value()
Naive date grabbing
_.chain(data) .map(timeEntry => timeEntry) .sortBy('start') .reverse() .filter(timeEntry => timeEntry.duration >= 0) .groupBy(timeEntry => timeEntry.start.slice(0, 10)) .value()

Run results for: simple stuffddd x2

Lodash

Native

Lodash with defined group

Naive date grabbing