Run results for: Direct access vs prototype lookup

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 YaBrowser/24.7.0.0 Safari/537.36

Browser: Yandex Browser 24

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Proto

123K/s

Semi-proto

122K/s

Direct

118K/s

View exact numbers

Test name	Executions per second
✓ Proto	122,831 Ops/sec
Semi-proto	122,487 Ops/sec
Direct	118,259 Ops/sec

Script Preparation code:

var LD = Array(100).fill(1).map(() => ({ x: 1, y: 2 }))

var P1  = { x: 1 }
var LP1 = Array(100).fill(1).map(() => { var A = Object.create(P1); A.y = 2; return A })

var P2  = { x: 1, y: 2 }
var LP2 = Array(100).fill(1).map(() => Object.create(P2))

Tests:

Direct
var S = 0 for (let x = 0; x < 100; x++) { let next = LD[x] S = (S + next.x + next.y) } console.log(S)
Semi-proto
var S = 0 for (let x = 0; x < 100; x++) { let next = LP1[x] S = (S + next.x + next.y) } console.log(S)
Proto
var S = 0 for (let x = 0; x < 100; x++) { let next = LP2[x] S = (S + next.x + next.y) } console.log(S)