Run results for: New array using two slices vs one slice plus overwrite 2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.0.1 Safari/605.1.15

Browser: Safari 12

Operating system: Mac OS X 10.13.6

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Override	10924730.0 Ops/sec
Separate slices	6956112.0 Ops/sec

Tests:

Override
const a = [{a: 1}, {a: 2}, {a: 3}, {a: 4}, {a: 5}, {a: 6}]; const b = a.slice(); b[1] = {a: 'x'};
Separate slices
const a = [{a: 1}, {a: 2}, {a: 3}, {a: 4}, {a: 5}, {a: 6}]; const b = [...a.slice(0, 1), {a: 'x'}, ...a.slice(2)];