Run results for: Splice vs Spread (immutable only)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.92 Safari/537.36

Browser: Chrome 81

Operating system: Mac OS X 10.14.6

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Splice method	10333232.0 Ops/sec
Spread method	6312256.5 Ops/sec

Tests:

Splice method
const arr = [0,1,2,3,4,5,6,7,8,9]; let out = [...arr].splice(2, 1, 123)
Spread method
const arr = [0,1,2,3,4,5,6,7,8,9]; let out = [...arr.slice(0,2), 123, ...arr.slice(3)];