Benchmark: Performance of JavaScript .reduce vs. for vs. for..of

Tests:

for
const r = 0; for (let i = 0; i < array.length; ++i) { r += array[i].a + array[i].b; }
.reduce
array.reduce((p, x) => p + x.a + x.b, 0);
.reduce (destructuring)
array.reduce((p, {a,b}) => p + a + b, 0);
for..of (reduce)
let r = 0; for (const x of array) { r += x.a + x.b; }
for..of (reduce) (destructuring)
let r = 0; for (const {a,b} of array) { r += a + b; }

Historical Performance Data aggregated from 5 community runs

Desktop Results:

Chrome 5 runs

for..of (reduce)

170.4M/s

for

161.5M/s

for..of (reduce) (destructuring)

158.8M/s

.reduce (destructuring)

115.3M/s

.reduce

60.2M/s

Fastest: for..of (reduce) (2.8x faster)

View exact numbers

✓ for..of (reduce): 170,421,568 ops/sec
• for: 161,457,120 ops/sec
• for..of (reduce) (destructuring): 158,846,496 ops/sec
• .reduce (destructuring): 115,342,624 ops/sec
• .reduce: 60,184,472 ops/sec

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

Test case name	Result
for
.reduce
.reduce (destructuring)
for..of (reduce)
for..of (reduce) (destructuring)

Latest run results:

Run details: (Test run date: 9 hours ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36

Browser/OS: Chrome 150 on Mac OS X 10.15.7

View result in a separate tab

for..of (reduce) (destructuring)

211.5M/s

for..of (reduce)

211.2M/s

for

210.4M/s

.reduce

197.8M/s

.reduce (destructuring)

197.1M/s

View exact numbers

Test name	Executions per second
✓ for..of (reduce) (destructuring)	211,501,376 Ops/sec
for..of (reduce)	211,188,288 Ops/sec
for	210,398,096 Ops/sec
.reduce	197,806,256 Ops/sec
.reduce (destructuring)	197,065,056 Ops/sec

Performance of JavaScript .reduce vs. for vs. for..of (version: 1)

Comparing performance of: `for vs .reduce vs .reduce (destructuring) vs for..of (reduce) vs for..of (reduce) (destructuring)`

Created: one year ago by: Registered User

Go to the latest result

for

.reduce

.reduce (destructuring)

for..of (reduce)

for..of (reduce) (destructuring)

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

Performance of JavaScript .reduce vs. for vs. for..of (version: 1)

Comparing performance of: for vs .reduce vs .reduce (destructuring) vs for..of (reduce) vs for..of (reduce) (destructuring)

Created: one year ago by: Registered User

Go to the latest result

for

.reduce

.reduce (destructuring)

for..of (reduce)

for..of (reduce) (destructuring)

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: `for vs .reduce vs .reduce (destructuring) vs for..of (reduce) vs for..of (reduce) (destructuring)`