Run results for: Plain Object Check: constructor vs prototype

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:142.0) Gecko/20100101 Firefox/142.0

Browser: Firefox 142

Operating system: Windows

Device Platform: Desktop

Date tested: 8 months ago

Test name	Executions per second
constructor	180801.2 Ops/sec
prototype	155074.9 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