protochain

Get the prototype chain of an object or primitive as an Array.

Why

I often write this function, figure I should extract it. There are probably other utilities out there that do this but I couldn't find them so they're either poorly named/described or the search algorithm is not being very helpful or I simply searched for the wrong things.

Installation

> npm install protochain

Usage

ES5

var protochain = require('protochain')
 
protochain({})
// => [Object.prototype]
 
protochain(Object.create(null))
// => []
 
protochain(new Error('message'))
// => [Error.prototype, Object.prototype]
 
protochain(new TypeError('message'))
// => [TypeError.prototype, Error.prototype, Object.prototype]
 
// Inheritance
 
function Person() {
 
}
 
function FancyPerson() {
  Person.call(this)
}
 
FancyPerson.prototype = Object.create(Person.prototype)
 
protochain(new Person())
// => [Person.prototype, Object.prototype]
 
protochain(new FancyPerson())
// => [FancyPerson.prototype, Person.prototype, Object.prototype]
 
// Primitives are OK
 
protochain(123)
// => [Number.prototype, Object.prototype]
 
protochain('abc')
// => [String.prototype, Object.prototype]
 
protochain(/abc/)
// => [RegExp.prototype, Object.prototype]
 
protochain(true)
// => [Boolean.prototype, Object.prototype]
 
protochain(false)
// => [Boolean.prototype, Object.prototype]
 
// Null & Undefined === Empty List
 
protochain(null)
// => []
 
protochain(undefined)
// => []
 
protochain()
// => []

ES6

 
import protochain from 'protochain'
 
class Person {}
class FancyPerson extends Person {}
 
protochain(new Person())
// => [Person.prototype, Object.prototype]
 
protochain(new FancyPerson())
// => [FancyPerson.prototype, Person.prototype, Object.prototype])
 

License

MIT