Benchmark: Array Indexation vs. Array Access

Script Preparation code:

var testArray = ['one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine', 'ten', 'eleven', 'twelve', 'thirteen', 'fourteen', 'fifteen', 'sixteen', 'seventeen', 'nineteen', 'twenty'];

Tests:

array.includes at the beggining
testArray.includes('two'); testArray.includes('three'); testArray.includes('four'); testArray.includes('five');
array.includes at the end
testArray.includes('twenty'); testArray.includes('nineteen'); testArray.includes('eighteen'); testArray.includes('seventeen');
Indexation THEN check at the beggining
const testObject = {}; for (const key in testArray) testObject[key] = true; testObject['one']; testObject['two']; testObject['three']; testObject['four'];
Indexation THEN check at the end
const testObject = {}; for (const key in testArray) testObject[key] = true; testObject['twenty']; testObject['nineteen']; testObject['eighteen']; testObject['seventeen'];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
array.includes at the beggining
array.includes at the end
Indexation THEN check at the beggining
Indexation THEN check at the end

Fastest: N/A

Slowest: N/A

ⓘ Get performance results from real users on your website with Request Metrics.

Website Performance Monitoring by Request Metrics

Latest run results:

Run details: (Test run date: 6 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Safari/537.36

Browser/OS: Chrome 117 on Windows

View result in a separate tab

Test name	Executions per second
array.includes at the beggining	3646802.0 Ops/sec
array.includes at the end	3585005.0 Ops/sec
Indexation THEN check at the beggining	913455.5 Ops/sec
Indexation THEN check at the end	916763.0 Ops/sec

Array Indexation vs. Array Access (version: 0)

Checks whether it is faster to index an array before using it, or just using it as is, when few reads are involved

Comparing performance of: array.includes at the beggining vs array.includes at the end vs Indexation THEN check at the beggining vs Indexation THEN check at the end

Created: 9 months ago by: Guest

Jump to the latest result

array.includes at the beggining

array.includes at the end

Indexation THEN check at the beggining

Indexation THEN check at the end

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A