Run results for: Passing existing array vs spreading twice

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0

Browser: Firefox 91

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Passing array directly to second function	24997.5 Ops/sec
Spreading array an extra time	23085.1 Ops/sec

Script Preparation code:

data = [...Array(1000).keys()]

Tests:

Passing array directly to second function
function first(...data){ const res = data.map((n)=> parseInt(n)) return second(res) } function second(data){ const reducer = (acc, n)=> acc + n return data.reduce(reducer, 0) } first(...data)
Spreading array an extra time
function first(...data){ const res = data.map((n)=> parseInt(n)) return second(...res) } function second(...data){ const reducer = (acc, n)=> acc + n return data.reduce(reducer, 0) } first(...data)