Run results for: FlatMap vs For-Loop

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:145.0) Gecko/20100101 Firefox/145.0

Browser: Firefox 145

Operating system: Windows

Device Platform: Desktop

Date tested: 8 months ago

for loop

59K/s

flatMap

56K/s

View exact numbers

Test name	Executions per second
✓ for loop	58,773 Ops/sec
flatMap	56,460 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]); }