JavaScript: Create Object with Parent X

There are several ways to create a data object with a specified parent object.

Object.Create

obj = Object.Create(parentX)

[see Object.create]

Object Literal Expression

obj = { __proto__:parentX }

(not recommended)

[see Object.prototype.__proto__]

With Constructor

Use a constructor, by the following steps:

1. Define a function F with no return statement.
2. Set the prototype property: F.prototype = parentX
3. Create the object. const obj = new F.

[see Operator “new”]

With keyword “class”

1. Define a class named X. (the constructor should not contain return statement.)
2. JavaScript will create a object X.prototype.
3. new X(…)'s parent is X.prototype

[see Class]