Run results for: class with/without declared fields

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.3.1 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
class without declared fields	60087.6 Ops/sec
class with declared fields	59892.8 Ops/sec

Script Preparation code:

// classes declared here can't be accessed in test cases for some reason...

Tests:

class without declared fields
class X { constructor(foo, bar, baz) { this.foo = foo; this.bar = bar; this.baz = baz; } sum() { return this.foo + this.bar + this.baz; } } let i = 1000; let y = 0; while (i--) { let x = new X(1, 2, 3); y += x.foo + x.bar + x.baz; y += x.sum(); } return y;
class with declared fields
class X { foo; bar; baz; constructor(foo, bar, baz) { this.foo = foo; this.bar = bar; this.baz = baz; } sum() { return this.foo + this.bar + this.baz; } } let i = 1000; let y = 0; while (i--) { let x = new X(1, 2, 3); y += x.foo + x.bar + x.baz; y += x.sum(); } return y;