Prototypal Inheritance — JavaScript

Prototypal inheritance helps you reuse one object's property and method inside another.

Reuse != Copy/Reimplement its method  

[[Prototype]] — Every object in Javascript has a hidden property called [[Prototype]] that is either ‘null’ or references another Object.

Prototypal inheritance — When we read a property from ‘object’ and if it’s missing, then Javascript takes it from its ‘prototype object’. This is called prototypal inheritance/ prototypal chaining.

let developer = {
  code: true,
  isCoding(){
    console.log("on Work")
  }
}

let reactDeveloper = {
  reactSkills: true,
  __proto__: developer
}

reactDeveloper.reactSkills // true
reactDeveloper.code // true, because of prototypal inheritance, it tries to find
                    // 'code' property inside reactDeveloper. As it's not there,
                    // JS follows [[Prototype]] reference and find it in 'developer'
reactDeveloper.isCoding() // "on Work"

Limitations:
1. The reference can’t go in a circle, JS will throw an error
2. The value of __proto__ can either be object or null. other types are ignored.