Run results for: Plain Object Check: constructor vs prototype

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36

Browser: Chrome 127

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
constructor	8393.3 Ops/sec
prototype	4116.1 Ops/sec

Script Preparation code:

function MyType() {};
MyType.prototype.foo = "bar";

var fixture = [];
for (var idx = 0; idx < 1000; idx++) {
    if (Math.random() >= 0.5) {
        fixture.push(new MyType());
    } else {
        fixture.push({
            "foo": "bar"
        });
    }
}

Tests:

constructor
fixture.filter(function(e){ return e.constructor === Object; });
prototype
fixture.filter(function(e){ return Object.getPrototypeOf(e) === Object.prototype; });

Run results for: Plain Object Check: constructor vs prototype

Checks whether the given object is a plain Object.

constructor

prototype