Object.prototype.constructor

The constructor data property of an Object instance returns a reference to the constructor function that created the instance object. Note that the value of this property is a reference to the function itself, not a string containing the function’s name.

Note: This is a property of JavaScript objects. For the constructor method in classes, see its own reference page.

Any object (with the exception of null prototype objects) will have a constructor property on its [[Prototype]]. Objects created with literals will also have a constructor property that points to the constructor type for that object — for example, array literals create Array objects, and object literals create plain objects.