Run results for: spread vs mutation vs Object.assign for forEach callback

Run details:

User agent: Mozilla/5.0 (Linux; Android 8.1.0; BV5800 PRO) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Mobile Safari/537.36

Browser: Chrome Mobile 72

Operating system: Android 8.1.0

Device Platform: Mobile

Date tested: 5 years ago

Tests:

with spread operator
const range = (from, to) => { const output = [] for(var x = from; x < to; x++){ output.push(x) } return output } let acc = {}; range(0, 10).forEach((num) => { acc = { ...acc, [num]: num } })
with mutation
const range = (from, to) => { const output = [] for(var x = from; x < to; x++){ output.push(x) } return output } let acc = {}; range(0, 10).forEach((num) => { acc[num] = num })
with object assign
const range = (from, to) => { const output = [] for(var x = from; x < to; x++){ output.push(x) } return output } let acc = {}; range(0, 10).forEach((num) => { acc = Object.assign(acc, {[num]: num}) })