Run results for: FlatMap vs For-Loop

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36 Edg/141.0.0.0

Browser: Chrome 141

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 7 months ago

Test name	Executions per second
flatMap	17975.0 Ops/sec
for loop	29521.1 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

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:

flatMap
const input = Array.from({ length: 1000 }, (_, i) => [i, i + 1]); const result = input.flatMap(pair => pair);
for loop
const input = Array.from({ length: 1000 }, (_, i) => [i, i + 1]); const result = []; for (let i = 0; i < input.length; i++) { result.push(input[i][0], input[i][1]); }

Run results for: FlatMap vs For-Loop

flatMap

for loop