Run results for: Symbol in obj vs obj instanceof constructor 3

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Symbol in obj	49.6 Ops/sec
obj instanceof constructor	50.8 Ops/sec

Script Preparation code:

let Sym = Symbol("test")
class test {
  [Sym]
}
let obj = new test

Tests:

Symbol in obj
for (let i = 30000; --i;) {Sym in obj; Sym in []}
obj instanceof constructor
for (let i = 30000; --i;) {obj instanceof test; [] instanceof test}