getter_perf

getter_perf.js

var A = {
  _propA: 'fish',
  _propB: `cat${this._propA}`
}

var B = {
  _propA: 'fish',
  _propB: 'cat',
  get propA() {
    return this._propA
  },
  get propB() {
    return this._propB + this._propA
  }
}

var C = {
  _propA: 'fish',
  _propB: 'cat',
  propA: function () {
    return this._propA
  },
  propB: function () {
    return this._propB + this._propA
  }
}

var R, S;
var its = 10000000
T = Date.now()
for (var i=0; i<its; i++) {
  R = A._propA;
  S = A._propB;
}
console.log(`Elapsed: ${Date.now()-T}`)

T = Date.now()
for (var i=0; i<its; i++) {
  R = B.propA;
  S = B.propB;
}
console.log(`Elapsed: ${Date.now()-T}`)

T = Date.now()
for (var i=0; i<its; i++) {
  R = C.propA();
  S = C.propB();
}
console.log(`Elapsed: ${Date.now()-T}`)

Daves-MacBook-Pro:~ dave$ node -v
v6.9.2

Daves-MacBook-Pro:~ dave$ node getter_perf.js
Elapsed: 96
Elapsed: 2237
Elapsed: 186