Benchmark: Lodash keyBy vs JS Map from array (with small and large size)

Script Preparation code:

window.data = [];
for (let i = 0; i < 10000; i++) {
    data.push({
        key: `key${i}`
    });
}

window.dataBig = [];
for (let i = 0; i < 100000; i++) {
    dataBig.push({
        key: `key${i}`
    });
}

Tests:

Lodash keyBy (10k entries)
const keyed = _.keyBy(data, v => v.key)
JS Map (10k entries)
const map = new Map(data.map((o) => [o.key, o]));
Lodash keyBy (100k entries)
const keyed = _.keyBy(dataBig, v => v.key)
JS Map (100k entries)
const map = new Map(dataBig.map((o) => [o.key, o]));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Lodash keyBy (10k entries)
JS Map (10k entries)
Lodash keyBy (100k entries)
JS Map (100k entries)

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Mac OS X 10.15.7

View result in a separate tab

Lodash keyBy (10k entries)

2K/s

JS Map (10k entries)

2K/s

JS Map (100k entries)

165/s

Lodash keyBy (100k entries)

163/s

View exact numbers

Test name	Executions per second
✓ Lodash keyBy (10k entries)	2,310 Ops/sec
JS Map (10k entries)	1,809 Ops/sec
JS Map (100k entries)	165 Ops/sec
Lodash keyBy (100k entries)	163 Ops/sec

Lodash keyBy vs JS Map from array (with small and large size) (version: 1)

Comparing performance of: `Lodash keyBy (10k entries) vs JS Map (10k entries) vs Lodash keyBy (100k entries) vs JS Map (100k entries)`

Created: one year ago by: Guest

Go to the latest result

Lodash keyBy (10k entries)

JS Map (10k entries)

Lodash keyBy (100k entries)

JS Map (100k entries)

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Lodash keyBy vs JS Map from array (with small and large size) (version: 1)

Comparing performance of: Lodash keyBy (10k entries) vs JS Map (10k entries) vs Lodash keyBy (100k entries) vs JS Map (100k entries)

Created: one year ago by: Guest

Go to the latest result

Lodash keyBy (10k entries)

JS Map (10k entries)

Lodash keyBy (100k entries)

JS Map (100k entries)

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `Lodash keyBy (10k entries) vs JS Map (10k entries) vs Lodash keyBy (100k entries) vs JS Map (100k entries)`