Benchmark: string to Uint8Array #5

Script Preparation code:

let repeat_count=5000;
let pattern = 'abcdefgh';
var source = pattern.repeat(5);

Tests:

split + map + instance
const values = source.split('').map(c=>c.charCodeAt()); const res = new Uint8Array(values);
for .. in 1
const values = Array(source.length); for (let i in source) values[i]=source.charCodeAt(i); const res = new Uint8Array(values);
for .. in 2
const values = Array(); for (let i in source) values.push(source.charCodeAt()); const res = new Uint8Array(values);
classical loop
const values = Array(source.length); for (let i =0; i<source.length; i++) values[i]=source.charCodeAt(i); const res = new Uint8Array(values);
classical loop 2
const res = new Uint8Array(source.length); for (let i =0; i<source.length; i++) res[i]=source.charCodeAt(i);
for .. in loop 2
const res = new Uint8Array(source.length); for (let i in source) res[i]=source.charCodeAt(i);
split+forEach
const res = new Uint8Array(source.length); source.split('').forEach( (c,i) => res[i] = source.charCodeAt(i) )
for .. in loop 3
const res = new Uint8Array(source.length); for (let i in source) res[i]=source.charCodeAt(i);
for .. of loop 2
const res = new Uint8Array(source.length); let i=0; for (let c of source) res[i++]=c.charCodeAt();
from
const res = Uint8Array.from(source, c=>c.charCodeAt());
from + split
const res = Uint8Array.from(source.split(''), c=>c.charCodeAt());
TextEncoder
const res = new TextEncoder().encode(source)

Historical Performance Data aggregated from 18 community runs

Desktop Results:

Firefox 13 runs

classical loop 2

10.1M/s

classical loop

2.6M/s

split+forEach

1.4M/s

split + map + instance

733K/s

for .. of loop

656K/s

for .. of loop 2

525K/s

split + forEach + set

346K/s

for .. in loop

134K/s

for .. in loop 2

106K/s

for .. in loop 3

91K/s

Fastest: classical loop 2 (110.5x faster)

View exact numbers

✓ classical loop 2: 10,051,270 ops/sec
• classical loop: 2,619,424 ops/sec
• split+forEach: 1,427,314 ops/sec
• split + map + instance: 733,498 ops/sec
• for .. of loop: 655,526 ops/sec
• for .. of loop 2: 525,081 ops/sec
• split + forEach + set: 345,513 ops/sec
• for .. in loop: 134,444 ops/sec
• for .. in loop 2: 105,860 ops/sec
• for .. in loop 3: 90,996 ops/sec

Chrome 5 runs

split + map + instance

1.4M/s

for .. of loop

1.0M/s

classical loop 2

53K/s

classical loop

620/s

for .. in loop

589/s

Fastest: split + map + instance (2390.9x faster)

View exact numbers

✓ split + map + instance: 1,407,044 ops/sec
• for .. of loop: 1,019,043 ops/sec
• classical loop 2: 53,132 ops/sec
• classical loop: 620 ops/sec
• for .. in loop: 589 ops/sec

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
split + map + instance
for .. in 1
for .. in 2
classical loop
classical loop 2
for .. in loop 2
split+forEach
for .. in loop 3
for .. of loop 2
from
from + split
TextEncoder

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:126.0) Gecko/20100101 Firefox/126.0

Browser/OS: Firefox 126 on Mac OS X 10.15

View result in a separate tab

classical loop 2

9.9M/s

classical loop

2.6M/s

TextEncoder

2.5M/s

split+forEach

1.4M/s

for .. of loop 2

843K/s

split + map + instance

725K/s

from

672K/s

from + split

439K/s

for .. in 1

132K/s

for .. in 2

127K/s

for .. in loop 2

106K/s

for .. in loop 3

106K/s

View exact numbers

Test name	Executions per second
✓ classical loop 2	9,882,512 Ops/sec
classical loop	2,565,192 Ops/sec
TextEncoder	2,529,049 Ops/sec
split+forEach	1,427,314 Ops/sec
for .. of loop 2	842,994 Ops/sec
split + map + instance	724,890 Ops/sec
from	672,055 Ops/sec
from + split	438,502 Ops/sec
for .. in 1	131,956 Ops/sec
for .. in 2	127,467 Ops/sec
for .. in loop 2	105,923 Ops/sec
for .. in loop 3	105,692 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

string to Uint8Array #5 (version: 16)

copy bytes ascii string to Uint8Array

Comparing performance of: `split + map + instance vs for .. in 1 vs for .. in 2 vs classical loop vs classical loop 2 vs for .. in loop 2 vs split+forEach vs for .. in loop 3 vs for .. of loop 2 vs from vs from + split vs TextEncoder`

Created: 2 years ago by: Registered User

Go to the latest result

split + map + instance

for .. in 1

for .. in 2

classical loop

classical loop 2

for .. in loop 2

split+forEach

for .. in loop 3

for .. of loop 2

from

from + split

TextEncoder

Historical Performance Data aggregated from 18 community runs

Desktop Results:

Firefox 13 runs

Chrome 5 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

string to Uint8Array #5 (version: 16)

copy bytes ascii string to Uint8Array

Comparing performance of: split + map + instance vs for .. in 1 vs for .. in 2 vs classical loop vs classical loop 2 vs for .. in loop 2 vs split+forEach vs for .. in loop 3 vs for .. of loop 2 vs from vs from + split vs TextEncoder

Created: 2 years ago by: Registered User

Go to the latest result

split + map + instance

for .. in 1

for .. in 2

classical loop

classical loop 2

for .. in loop 2

split+forEach

for .. in loop 3

for .. of loop 2

from

from + split

TextEncoder

Historical Performance Data aggregated from 18 community runs

Desktop Results:

Firefox 13 runs

Chrome 5 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

Related benchmarks

Comparing performance of: `split + map + instance vs for .. in 1 vs for .. in 2 vs classical loop vs classical loop 2 vs for .. in loop 2 vs split+forEach vs for .. in loop 3 vs for .. of loop 2 vs from vs from + split vs TextEncoder`