Benchmark: new object vs new instance of new class

Tests:

object
let obj = {foo:42, bar: "bar", baz: true}
class
let obj = new class {foo = 42; bar = "bar"; baz = true}

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
object
class

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36

Browser/OS: Chrome 143 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
object	181235424.0 Ops/sec
class	1045792.9 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

I'd be happy to explain the benchmarking test.

**What is tested?**

The provided JSON represents two different test cases: creating an object using the `let` keyword and creating an instance of a class using the `new` keyword. The test aims to compare the performance difference between these two approaches.

**Options compared**

There are two options being compared:

1. **Let keyword**: Creating an object using the `let` keyword, e.g., `let obj = {foo:42, bar:"bar", baz:true}`.
2. **Class-based instance creation**: Creating an instance of a class using the `new` keyword, e.g., `let obj = new class { foo = 42; bar = "bar"; baz = true }`.

**Pros and cons**

1. **Let keyword**:
	* Pros: Easy to read and write, doesn't require explicit class definition.
	* Cons: May lead to confusion if the object's structure changes (e.g., adding or removing properties).
2. **Class-based instance creation**:
	* Pros: More explicit control over the object's structure, easier to extend with inheritance.
	* Cons: Requires explicit class definition, may be more verbose.

**Other considerations**

In JavaScript, objects can also be created using constructors (e.g., `new MyClass()`) or prototypal inheritance. However, these approaches are not directly tested in this benchmark.

**Library usage**

None of the test cases explicitly use a library. The comparison is focused on the basic syntax differences between object creation and class-based instance creation.

**Special JS features/syntax**

There is no special JavaScript feature or syntax used in either test case.

**Alternatives**

Other alternatives to create objects or instances of classes include:

* Using constructors (e.g., `MyClass()`)
* Using prototypal inheritance
* Using a library like Lodash or Ramda for object creation and manipulation
* Using a framework like React or Angular, which provide their own ways of creating components and managing state.

Keep in mind that these alternatives are not directly tested in this benchmark, but they demonstrate the diversity of approaches to object creation and class-based instance creation in JavaScript.

Related benchmarks:

new object vs new instance of new class (version: 0)

Comparing performance of: object vs class

Created: 2 years ago by: Registered User

Jump to the latest result

object

class

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):