Run results for: if-spread vs always-spread

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:144.0) Gecko/20100101 Firefox/144.0

Browser: Firefox 144

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 9 months ago

always-spread

30.4M/s

if-spread

22.9M/s

View exact numbers

Test name	Executions per second
✓ always-spread	30,409,694 Ops/sec
if-spread	22,947,782 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", }