Benchmark: Array looping - MeasureThat.net

Array looping (version: 0)

Finding out the fastest way to loop through an array

Comparing performance of: `Simple for loop vs Simple for loop (reverse) vs Array.forEach vs for loop + Array.entries vs while + Array.entries vs enumerable for loop (order not important) vs enumerable for loop (order is respected) vs Array.map vs Array.filter vs while + Array.entries (condensed) vs for loop + Array.entries (condensed) vs Simple for loop (condensed) vs Instructionless for loop`

Created: 9 years ago by: Registered User

Go to the latest result

Script Preparation code:

var arr = [];

for( var cpt = 0; cpt < 1000; cpt++ ) {
  arr.push( Math.random() );
}

var someFn = function( item ) {
  return item * 3 + item / 5;
}

Tests:

Simple for loop
for( var i = 0, n = arr.length; i < n; i++ ) { someFn( arr[ i ] ); }
Simple for loop (reverse)
for( var i = arr.length; i > -1; i-- ) { someFn( arr[ i ] ); }
Array.forEach
arr.forEach( someFn );
for loop + Array.entries
for( var e = arr.entries(), n = e.next(); ! n.done; n = e.next() ) { someFn( n.value[ 1 ] ); }
while + Array.entries
var e = arr.entries(), n = e.next(); while( ! n.done ) { someFn( n.value[ 1 ] ); n = e.next(); }
enumerable for loop (order not important)
for( var i in arr ) { someFn( arr[ i ] ); }
enumerable for loop (order is respected)
for( r of arr ) { someFn( r ); }
Array.map
arr.map( someFn );
Array.filter
arr.filter( someFn );
while + Array.entries (condensed)
var e = arr.entries(), n; while( ! ( n = e.next() ).done ) { someFn( n.value[ 1 ] ); }
for loop + Array.entries (condensed)
for( var e = arr.entries(), n; ! (n = e.next()).done; ) { someFn( n.value[ 1 ] ); }
Simple for loop (condensed)
for( var i = 0, n = arr.length; i < n; ) { someFn( arr[ i++ ] ); }
Instructionless for loop
for( var i = 0, n = arr.length; i < n; someFn( arr[ i++ ] ) ) ;

Historical Performance Data aggregated from 36 community runs

Desktop Results:

Chrome 30 runs

Array.forEach

96K/s

Array.map

79K/s

Array.filter

60K/s

for loop + Array.entries (condensed)

21K/s

while + Array.entries

20K/s

while + Array.entries (condensed)

19K/s

for loop + Array.entries

18K/s

Simple for loop (condensed)

12K/s

Instructionless for loop

12K/s

Simple for loop

12K/s

Simple for loop (reverse)

11K/s

enumerable for loop (order not important)

10K/s

enumerable for loop (order is respected)

5K/s

Fastest: Array.forEach (20.3x faster)

View exact numbers

✓ Array.forEach: 95,956 ops/sec
• Array.map: 79,125 ops/sec
• Array.filter: 59,578 ops/sec
• for loop + Array.entries (condensed): 20,538 ops/sec
• while + Array.entries: 20,472 ops/sec
• while + Array.entries (condensed): 18,644 ops/sec
• for loop + Array.entries: 18,222 ops/sec
• Simple for loop (condensed): 12,386 ops/sec
• Instructionless for loop: 11,755 ops/sec
• Simple for loop: 11,726 ops/sec
• Simple for loop (reverse): 10,507 ops/sec
• enumerable for loop (order not important): 10,246 ops/sec
• enumerable for loop (order is respected): 4,722 ops/sec

Firefox 6 runs

Simple for loop

1.0M/s

Instructionless for loop

1.0M/s

Simple for loop (condensed)

837K/s

Array.forEach

305K/s

Array.map

148K/s

Array.filter

143K/s

Simple for loop (reverse)

106K/s

for loop + Array.entries (condensed)

70K/s

while + Array.entries (condensed)

69K/s

enumerable for loop (order is respected)

65K/s

for loop + Array.entries

51K/s

while + Array.entries

50K/s

enumerable for loop (order not important)

10K/s

Fastest: Simple for loop (99.5x faster)

View exact numbers

✓ Simple for loop: 1,041,282 ops/sec
• Instructionless for loop: 1,018,848 ops/sec
• Simple for loop (condensed): 837,387 ops/sec
• Array.forEach: 305,194 ops/sec
• Array.map: 148,112 ops/sec
• Array.filter: 142,747 ops/sec
• Simple for loop (reverse): 106,158 ops/sec
• for loop + Array.entries (condensed): 70,493 ops/sec
• while + Array.entries (condensed): 68,961 ops/sec
• enumerable for loop (order is respected): 65,365 ops/sec
• for loop + Array.entries: 50,519 ops/sec
• while + Array.entries: 50,117 ops/sec
• enumerable for loop (order not important): 10,467 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
Simple for loop
Simple for loop (reverse)
Array.forEach
for loop + Array.entries
while + Array.entries
enumerable for loop (order not important)
enumerable for loop (order is respected)
Array.map
Array.filter
while + Array.entries (condensed)
for loop + Array.entries (condensed)
Simple for loop (condensed)
Instructionless for loop

Fastest: N/A

Slowest: N/A

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/134.0.0.0 Safari/537.36

Browser/OS: Chrome 134 on Windows

View result in a separate tab

Array.forEach

5.3M/s

Simple for loop

1.0M/s

Simple for loop (condensed)

992K/s

Instructionless for loop

966K/s

Array.map

727K/s

Simple for loop (reverse)

579K/s

Array.filter

469K/s

for loop + Array.entries (condensed)

297K/s

while + Array.entries (condensed)

296K/s

for loop + Array.entries

280K/s

while + Array.entries

251K/s

enumerable for loop (order not important)

97K/s

enumerable for loop (order is respected)

19K/s

View exact numbers

Test name	Executions per second
✓ Array.forEach	5,261,475 Ops/sec
Simple for loop	1,031,806 Ops/sec
Simple for loop (condensed)	991,528 Ops/sec
Instructionless for loop	965,657 Ops/sec
Array.map	727,368 Ops/sec
Simple for loop (reverse)	579,251 Ops/sec
Array.filter	469,382 Ops/sec
for loop + Array.entries (condensed)	297,257 Ops/sec
while + Array.entries (condensed)	296,459 Ops/sec
for loop + Array.entries	280,309 Ops/sec
while + Array.entries	251,312 Ops/sec
enumerable for loop (order not important)	97,079 Ops/sec
enumerable for loop (order is respected)	18,884 Ops/sec

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

LLMs can make mistakes. Check important info.

Array looping (version: 0)

Finding out the fastest way to loop through an array

Created: 9 years ago by: Registered User

Go to the latest result

Simple for loop

Simple for loop (reverse)

Array.forEach

for loop + Array.entries

while + Array.entries

enumerable for loop (order not important)

enumerable for loop (order is respected)

Array.map

Array.filter

while + Array.entries (condensed)

for loop + Array.entries (condensed)

Simple for loop (condensed)

Instructionless for loop

Historical Performance Data aggregated from 36 community runs

Desktop Results:

Chrome 30 runs

Firefox 6 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

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