Run results for: Object.assign vs spread operator vs property accessor 2

Run details:

User agent: Mozilla/5.0 (Linux; Android 7.0; LG-M400) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.101 Mobile Safari/537.36

Browser: Chrome Mobile 87

Operating system: Android 7.0

Device Platform: Mobile

Date tested: 3 years ago

Script Preparation code:

var arr = [...Array(10).keys()];
var alphabet = [...'abcdefghijklmnopqrstuvwxyz'];

Tests:

Object.assign
arr.reduce((acc, cur) => Object.assign(acc, { [alphabet[cur]]: cur }), {});
spread operator
arr.reduce((acc, cur) => ({ ...acc, [alphabet[cur]]: cur }), {});
property accessor
arr.reduce((acc, cur) => { acc[alphabet[cur]] = cur; return acc; }, {});
property accessor 2
arr.reduce((acc, cur) => { return (acc[alphabet[cur]] = cur); }, {});