Run results for: spread vs Object.assign for reduce callback with large dataset

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Browser: Chrome 67

Operating system: Windows

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
with spread operator	7.9 Ops/sec
with object assign	318.2 Ops/sec

Tests:

with spread operator
const range = (from, to) => { const output = [] for(var x = from; x < to; x++){ output.push(x) } return output } range(0, 1000).reduce((acc, num) => { return { ...acc, [num]: num } }, {})
with object assign
const range = (from, to) => { const output = [] for(var x = from; x < to; x++){ output.push(x) } return output } range(0, 1000).reduce((acc, num) => { return Object.assign(acc, {[num]: num}) }, {})