Benchmark: Lodash.js vs Javascript (meanBy) 3

Script Preparation code:

// Sample data
const data = Array.from({ length: 1_000_000 }, (_, i) => ({ value: i % 100 }));

// 1. Lodash
function lodashMeanBy(array, fn) {
  return _.meanBy(array, fn);
}

// 2. Reduce
function reduceMeanBy(array, fn) {
  const sum = array.reduce((acc, obj) => acc + fn(obj), 0);
  return sum / array.length;
}

// 3. For loop
function forLoopMeanBy(array, fn) {
  let sum = 0;
  for (let i = 0; i < array.length; i++) {
    sum += fn(array[i]);
  }
  return sum / array.length;
}

// 4. For...of
function forOfMeanBy(array, fn) {
  let sum = 0;
  for (const item of array) {
    sum += fn(item);
  }
  return sum / array.length;
}

// 5. While loop
function whileMeanBy(array, fn) {
  let sum = 0;
  let i = 0;
  const len = array.length;
  while (i < len) {
    sum += fn(array[i++]);
  }
  return sum / len;
}

// 6. forEach
function forEachMeanBy(array, fn) {
  let sum = 0;
  array.forEach(item => {
    sum += fn(item);
  });
  return sum / array.length;
}

const accessor = obj => obj.value;

Tests:

reduceMeanBy
reduceMeanBy(data, accessor)
lodashMeanBy
lodashMeanBy(data, accessor)
forLoopMeanBy
forLoopMeanBy(data, accessor)
forOfMeanBy
forOfMeanBy(data, accessor)
whileMeanBy
whileMeanBy(data, accessor)
forEachMeanBy
forEachMeanBy(data, accessor)

Historical Performance Data aggregated from 5 community runs

Desktop Results:

Chrome 5 runs

forOfMeanBy

543/s

whileMeanBy

490/s

forLoopMeanBy

464/s

forEachMeanBy

238/s

lodashMeanBy

144/s

reduceMeanBy

110/s

Fastest: forOfMeanBy (5.0x faster)

View exact numbers

✓ forOfMeanBy: 543 ops/sec
• whileMeanBy: 490 ops/sec
• forLoopMeanBy: 464 ops/sec
• forEachMeanBy: 238 ops/sec
• lodashMeanBy: 144 ops/sec
• reduceMeanBy: 110 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Test case name	Result
reduceMeanBy
lodashMeanBy
forLoopMeanBy
forOfMeanBy
whileMeanBy
forEachMeanBy

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser/OS: Chrome 136 on Windows

View result in a separate tab

forOfMeanBy

562/s

forLoopMeanBy

500/s

whileMeanBy

490/s

forEachMeanBy

239/s

lodashMeanBy

144/s

reduceMeanBy

115/s

View exact numbers

Test name	Executions per second
✓ forOfMeanBy	562 Ops/sec
forLoopMeanBy	500 Ops/sec
whileMeanBy	490 Ops/sec
forEachMeanBy	239 Ops/sec
lodashMeanBy	144 Ops/sec
reduceMeanBy	115 Ops/sec

Lodash.js vs Javascript (meanBy) 3 (version: 1)

Comparing performance of: `reduceMeanBy vs lodashMeanBy vs forLoopMeanBy vs forOfMeanBy vs whileMeanBy vs forEachMeanBy`

Created: one year ago by: Guest

Go to the latest result

reduceMeanBy

lodashMeanBy

forLoopMeanBy

forOfMeanBy

whileMeanBy

forEachMeanBy

Historical Performance Data aggregated from 5 community runs

Desktop Results:

Chrome 5 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Lodash.js vs Javascript (meanBy) 3 (version: 1)

Comparing performance of: reduceMeanBy vs lodashMeanBy vs forLoopMeanBy vs forOfMeanBy vs whileMeanBy vs forEachMeanBy

Created: one year ago by: Guest

Go to the latest result

reduceMeanBy

lodashMeanBy

forLoopMeanBy

forOfMeanBy

whileMeanBy

forEachMeanBy

Historical Performance Data aggregated from 5 community runs

Desktop Results:

Chrome 5 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `reduceMeanBy vs lodashMeanBy vs forLoopMeanBy vs forOfMeanBy vs whileMeanBy vs forEachMeanBy`