Run results for: custom WeakMap vs Symbol Property

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser: Chrome 134

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

CustomWeakMap get

173.8M/s

Symbol Property set

173.7M/s

CustomWeakMap set

167.2M/s

Symbol Property get

153.4M/s

WeakMap set

102.6M/s

WeakMap get

97.7M/s

View exact numbers

Test name	Executions per second
✓ CustomWeakMap get	173,829,632 Ops/sec
Symbol Property set	173,704,560 Ops/sec
CustomWeakMap set	167,226,688 Ops/sec
Symbol Property get	153,358,800 Ops/sec
WeakMap set	102,614,104 Ops/sec
WeakMap get	97,679,648 Ops/sec

Script Preparation code:

class CustomWeakMap {
  constructor(relationKey = '__relation') {
    this.relationKey = relationKey;
  }

  // 设置键值对 - 使用直接属性赋值以提高性能
  set(key, value) {
    key[this.relationKey] = value;
    return this;
  }

  // 获取键对应的值
  get(key) {
    return key[this.relationKey];
  }

  // 检查键是否存在
  has(key) {
    return this.relationKey in key;
  }

  // 删除键值对
  delete(key) {
    return delete key[this.relationKey];
  }
}
var to0 = {};
var to1 = {};
var to2 = {}
var wm = new WeakMap();
var sy = Symbol();
var cy = new CustomWeakMap();
wm.set(to1, 1);
to1[sy] = 1;
cy.set(to2,1)

Tests:

WeakMap set
wm.set(to0, 1);
Symbol Property set
to0[sy] = 1;
WeakMap get
let r = wm.get(to1);
Symbol Property get
let r = to1[sy];
CustomWeakMap set
cy.set(to2, 1);
CustomWeakMap get
let r = cy.get(to2);