Check the prototype of an object in JavaScript

javascript-prototypes.js

var buffer = Buffer.from('something')

console.log('buffer.__proto__')
console.log(buffer.__proto__)
console.log()

console.log('buffer instanceof Buffer')
console.log(buffer instanceof Buffer)
console.log()

console.log('buffer.constructor')
console.log(buffer.constructor)
console.log()


console.log('buffer.constructor.name')
console.log(buffer.constructor.name)
console.log()

console.log('Object.getPrototypeOf(buffer)')
console.log(Object.getPrototypeOf(buffer))
console.log()

buffer.__proto__
Buffer {
  readBigUInt64LE: [Function: readBigUInt64LE],
  // ...
  // ...
  toLocaleString: [Function: toString],
  [Symbol(nodejs.util.inspect.custom)]: [Function: inspect] }

buffer instanceof Buffer
true

buffer.constructor
{ [Function: Buffer]
  poolSize: 8192,
  from: [Function: from],
  of: [Function: of],
  alloc: [Function: alloc],
  allocUnsafe: [Function: allocUnsafe],
  allocUnsafeSlow: [Function: allocUnsafeSlow],
  isBuffer: [Function: isBuffer],
  compare: [Function: compare],
  isEncoding: [Function: isEncoding],
  concat: [Function: concat],
  byteLength: [Function: byteLength],
  [Symbol(kIsEncodingSymbol)]: [Function: isEncoding] }

buffer.constructor.name
Buffer

Object.getPrototypeOf(buffer)
Buffer {
  readBigUInt64LE: [Function: readBigUInt64LE],
  // ...
  // ...
  toLocaleString: [Function: toString],
  [Symbol(nodejs.util.inspect.custom)]: [Function: inspect] }