Run results for: if-spread vs always-spread

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.0.1 Safari/605.1.15

Browser: Safari 26

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 9 months ago

if-spread

64.8M/s

always-spread

60.5M/s

View exact numbers

Test name	Executions per second
✓ if-spread	64,805,892 Ops/sec
always-spread	60,488,844 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:

if-spread
const obj = { mr: 1, ml: 1, p: 1 }; const result = Object.keys(obj).length > 0; const newObj = { ...(result ? obj : undefined), some: "keys", hello: "world", }
always-spread
const obj = { mr: 1, ml: 1, p: 1 }; const newObj = { ...obj, some: "keys", hello: "world", }