Benchmark: Object.freeze vs Object.seal - Access only

Script Preparation code:

var normal = {
  x: 0,
  y: 0
};
var freeze = Object.freeze({
  x: 0,
  y: 0
});
var seal = Object.seal({
  x: 0,
  y: 0
});

Tests:

normal
normal.x; normal.y;
freeze
freeze.x; freeze.y;
seal
seal.x; seal.y;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
normal
freeze
seal

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:133.0) Gecko/20100101 Firefox/133.0

Browser/OS: Firefox 133 on Linux

View result in a separate tab

Test name	Executions per second
normal	1672168448.0 Ops/sec
freeze	1669197696.0 Ops/sec
seal	1672064128.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**What is being tested?**

The provided JSON represents a benchmark test that compares the performance of three different approaches:

1. `Object.freeze()`: This method creates an immutable object, meaning its properties cannot be modified after creation.
2. `Object.seal()`: This method creates a partially frozen object, which can have some properties frozen while allowing others to be modified.

The benchmark tests the execution time of accessing the `x` and `y` properties on these objects using different methods:

* Accessing individual property names (`normal.x`, `freeze.x`, etc.)
* Property name as an array (`normal['x']`, `freeze['x']`, etc.)

**Options compared**

The two main options being compared are:

1. **Immutable object**: An object created with `Object.freeze()` cannot be modified after creation, making it a good choice when data is not expected to change.
2. **Partially frozen object**: An object created with `Object.seal()` can have some properties frozen while allowing others to be modified, which can provide a balance between flexibility and immutability.

**Pros and Cons**

* **Immutable object (`Object.freeze()`)**
	+ Pros: Ensures data is not modified accidentally or intentionally, reduces side effects in functions that return objects.
	+ Cons: Can lead to slower execution when accessing properties using bracket notation (`normal['x']`).
* **Partially frozen object (`Object.seal()`)**
	+ Pros: Allows for some flexibility while still ensuring certain properties are protected from modification.
	+ Cons: May lead to unexpected behavior if the wrong property is modified accidentally or intentionally.

**Library and purpose**

In this benchmark, no libraries are explicitly mentioned. However, `Object` and its methods (`freeze()`, `seal()`) are part of the built-in JavaScript API.

**Special JS feature or syntax**

There is a special way to access object properties using bracket notation: `[property_name]`. For example, `normal['x']` instead of just `normal.x`.

**Other alternatives**

Some alternative approaches to testing this scenario could include:

* Using other methods to freeze or seal objects, such as `Object.prototype.freeze()` or `Object.assign()`.
* Creating custom classes or prototypes with similar behavior.
* Comparing performance using different data types (e.g., numbers, strings, booleans).

Keep in mind that these alternatives might not directly address the specific question being asked and might require significant changes to the benchmark test.

Related benchmarks:

Object.freeze vs Object.seal - Access only (version: 0)

Comparing performance of: normal vs freeze vs seal

Created: 2 years ago by: Guest

Jump to the latest result

normal

freeze

seal

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):