Benchmark: Lodash keyBy vs JS Map (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(); for (let i = 0; i < data.length; i++) { map.set(data[i].key, data[i]); }
Lodash keyBy (100k entries)
const keyed = _.keyBy(dataBig, v => v.key)
JS Map (100k entries)
const map = new Map(); for (let i = 0; i < dataBig.length; i++) { map.set(dataBig[i].key, dataBig[i]); }

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

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Latest run results:

Run details: (Test run date: 28 days ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser/OS: Chrome 123 on Windows

View result in a separate tab

Test name	Executions per second
Lodash keyBy (10k entries)	1680.6 Ops/sec
JS Map (10k entries)	262.0 Ops/sec
Lodash keyBy (100k entries)	80.6 Ops/sec
JS Map (100k entries)	23.4 Ops/sec

Lodash keyBy vs JS Map (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: Registered User

Jump 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>

Experimental features:

Fastest: N/A

Slowest: N/A