Any function when prefixed with "new" keyword at the time of invocation acts like a constructor function.

Name of the function should be "constructor"

You have to assign a property named "constructor" and assign a function to it

Constructor function cannot be created in javascript

class SubClass extends BaseClass { }

function SubClass() {
BaseClass.apply(this, Array.prototype.slice.call(arguments, 0);
}
SubClass.prototype = Object.create(BaseClass.prototype);

function SubClass() {
BaseClass.apply(this, Array.prototype.slice.call(arguments, 0);
}

function SubClass() {
super(Array.prototype.slice.call(arguments, 0));
}
SubClass.prototype = Object.create(BaseClass.prototype);

Every function has a Closure scope associated with it

Every time a inner function is defined within another function

When an inner function is defined within another function and that refers to variables that are available at the defining function (local variables of enclosing functions and its parent right until global)

A closure keyword is available. When a variable is declared with that modifier, closure scope is created

const myConstant = 3.414;

var myConstant = { value : "3.414";}

var myConstant = new Object(3.414)

var myConstant = Object.create(null, { value: {
configurable : false,
writable : false,
enumerable : false,
value : 3.414
}
});

Inheritance using extends keyword

Inheritance through Constructor chaining

Inheritance through Prototype chaining

Inheritance achieved programmatically

Using closure

Using JSON

Using Object.defineProperty and specify only get and no set function

By making the property private

Define the property with private modifier

It is not possible to stop removing the property from object

Every property defined using "Object.defineProperty" cannot be removed

Using Object.defineProperty and setting "configurable" to false

Using temporary inner / anonymous function functions

Using just closure

Using constructor

Using window object

Using var

Using let

Using const

Using def