Run results for: Test join vs concat string

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser: Chrome 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

concat

152.6M/s

concat 2x

151.8M/s

join

8.8M/s

join 2x

6.4M/s

View exact numbers

Test name	Executions per second
✓ concat	152,588,880 Ops/sec
concat 2x	151,766,768 Ops/sec
join	8,817,620 Ops/sec
join 2x	6,396,048 Ops/sec

HTML Preparation code:

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Script Preparation code:

/*your preparation JavaScript code goes here
To execute async code during the script preparation, wrap it as function globalMeasureThatScriptPrepareFunction, example:*/
async function globalMeasureThatScriptPrepareFunction() {
    // This function is optional, feel free to remove it.
    // await someThing();
}

Tests:

concat
const sep = ',' const q = 'a' + sep + 'b' + sep + 'c'
join
const arr = ['a', 'b', 'c'] const q2 = arr.join(',')
concat 2x
const sep = ',' const q = 'a' + sep + 'b' + sep + 'c' + 'a' + sep + 'b' + sep + 'c'
join 2x
const arr = ['a', 'b', 'c', 'a', 'b', 'c'] const q2 = arr.join(',')