class-w-private-fields.js

'use strict'

// this is run only on v12, because private field

const ITERATION = 1000
console.log(
  process.version,
  ITERATION,
  'iteration',
  'with Type and freeze – v2: v12 only, private field'
)

/**
 * Type enumeration.
 * @readonly
 * @enum {string}
 */
const Type = {
  /** Homo sapiens sapiens */
  HUMAN: 'HUMAN',
  /** brrr... zz... */
  ROBOT: 'ROBOT'
}
Object.freeze(Type)

// class test

class Human3 {
  #iq
  #name
  #type

  constructor ({ iq, name }) {
    this.#iq = iq
    this.#name = name
    this.#type = [Type.HUMAN]
  }

  setIQLevel (iq) {
    this.#iq = iq
  }
  getIQLevel () {
    this.#iq
  }
  setName (name) {
    this.#name = name
  }
  getName () {
    return this.#name
  }
  getType () {
    return this.#type
  }
  get () {
    return {
      type: this.#type,
      iq: this.#iq,
      name: this.#name
    }
  }
}

let i = 0
let KatrineBrewster
let start = process.hrtime.bigint()
while (i < ITERATION) {
  KatrineBrewster = new Human3({ iq: 154, name: 'KatrineBrewster' })
  i++
}
let end = process.hrtime.bigint()
let classExampleTime = end - start

console.info(`CLASS with private field: ${classExampleTime} nanosec.`)