Run results for: conditionally insert properties

Run details:

User agent: Mozilla/5.0 (Linux; Android 11; Pixel 3a Build/RQ2A.210405.005; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/90.0.4430.66 Mobile Safari/537.36

Browser: Chrome Mobile 90

Operating system: Android

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
boring	1680498.0 Ops/sec
spread	1517805.0 Ops/sec
Object.assign	827713.8 Ops/sec

Tests:

boring
const obj = { hello: "world" }; if (Math.random()>.5) { obj.foo = "bar"; }
spread
const obj = { hello: "world", ...Math.random()>.5 && { foo: "bar" } };
Object.assign
const obj = Object.assign({ hello: "world" }, Math.random()>.5 && { foo: "bar" });

Run results for: conditionally insert properties

https://www.reddit.com/r/javascript/comments/mrzrty/the_shortest_way_to_conditionally_insert/

boring

spread

Object.assign