Run results for: ObjectDefineProperty

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser: Chrome 119

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
One	40.0 Ops/sec
Two	25.2 Ops/sec

Script Preparation code:

const obj = {};
obj.data = {
  firstName: 'John',
  lastName: 'Doe',
};

// 定义带有 getter 的属性
Object.defineProperty(obj, 'name', {
  get() {
    return this.data.firstName;
  },
});

Tests:

One
const obj = {}; obj.data = { firstName: 'John', lastName: 'Doe', }; // 定义带有 getter 的属性 Object.defineProperty({}, 'name', { get() { return this.data.firstName; }, }); const temp = {}; for (let i = 0; i < 1000000; i++) { temp[i.toString()] = obj.data.firstName; }
Two
const obj = {}; obj.data = { firstName: 'John', lastName: 'Doe', }; // 定义带有 getter 的属性 Object.defineProperty(obj, 'name', { get() { return this.data.firstName; }, }); const temp = {}; for (let i = 0; i < 1000000; i++) { temp[i.toString()] = obj.name; }

Run results for: ObjectDefineProperty

One

Two