Benchmark: instanceof vs in options

Script Preparation code:

class ClassFoo {
    constructor() {
        this.bar = 'classFoo';
    }
}

var knownTypes = ['otherClass', 'classFoo'];
var Foo = ClassFoo;
var foo = new Foo();

Tests:

instanceof test
foo instanceof Foo
in test
'bar' in foo
instanceof test again
foo instanceof Foo
proper type check
'bar' in foo && (foo.bar === 'otherClass' || foo.bar === 'classFoo')
includes check
'bar' in foo && knownTypes.includes(foo.bar)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
instanceof test
in test
instanceof test again
proper type check
includes check

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Firefox/138.0

Browser/OS: Firefox 138 on Windows

View result in a separate tab

Test name	Executions per second
instanceof test	157504400.0 Ops/sec
in test	1553290624.0 Ops/sec
instanceof test again	160112240.0 Ops/sec
proper type check	1387363968.0 Ops/sec
includes check	45093188.0 Ops/sec

Related benchmarks:

instanceof vs in options (version: 1)

Comparing performance of: instanceof test vs in test vs instanceof test again vs proper type check vs includes check

Created: one year ago by: Guest

Jump to the latest result

instanceof test

in test

instanceof test again

proper type check

includes check

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A