Function: prototype

function Ctor() {}
const inst = new Ctor();
console.log(Object.getPrototypeOf(inst) === Ctor.prototype); // true

async function* asyncGeneratorFunction() {}
function* generatorFunction() {}

const method = { foo() {} }.foo;
const arrowFunction = () => {};
async function asyncFunction() {}

class Class {}
function fn() {}

const boundFunction = function () {}.bind(null);

function Ctor() {}
Ctor.prototype = 3;
console.log(Object.getPrototypeOf(new Ctor()) === Object.prototype); // true

function Ctor() {}
const p1 = new Ctor();
const p2 = new Ctor();
Ctor.prototype.prop = 1;
console.log(p1.prop); // 1
console.log(p2.prop); // 1

class Dog {
  constructor(name) {
    this.name = name;
  }
}

Dog.prototype.species = "dog";

console.log(new Dog("Jack").species); // "dog"

class Dog {
  static {
    Dog.prototype.species = "dog";
  }
  constructor(name) {
    this.name = name;
  }
}

console.log(new Dog("Jack").species); // "dog"