Benchmark: Object.assign vs "static" assign

Script Preparation code:

var o = { a: 1, b: 2, c: 3 };

Tests:

Object.assign
const o2 = Object.assign({}, o); o2.a += 10; o2.b = 20; o2.c -= 30; console.log(o);
"static" assign
const o2 = { a: o.a + 10, b: 20, c: o.c - 30 }; console.log(o);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.assign
"static" assign

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:129.0) Gecko/20100101 Firefox/129.0

Browser/OS: Firefox 129 on Windows

View result in a separate tab

Test name	Executions per second
Object.assign	293309.1 Ops/sec
"static" assign	321725.5 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what is being tested, compared, and their pros and cons.

**Benchmark Overview**

The benchmark compares two approaches to assign values to an object:

1. **`Object.assign()`**: A built-in JavaScript method that creates a new object by copying all enumerable properties from one or more source objects.
2. **"static" assign**: A shorthand syntax for assigning values to object properties directly, without using the `=` operator.

**Library and Purpose**

In this benchmark, no libraries are explicitly mentioned. However, `Object.assign()` is a built-in JavaScript method, which means it's part of the language itself.

**Special JS Feature or Syntax**

This benchmark uses the "static" assign syntax, which is a shorthand way to assign values to object properties without using the `=` operator. This syntax was introduced in ECMAScript 2015 (ES6) and allows for more concise code.

**Test Cases**

The benchmark consists of two test cases:

1. **`Object.assign()`**: This test case uses the `Object.assign()` method to create a new object, assign values from an existing object (`o`), and then modify some properties.
2. **"static" assign**: This test case uses the "static" assign syntax to directly assign values to object properties without using the `=` operator.

**Options Compared**

The benchmark compares two approaches:

1. **`Object.assign()`**: A more explicit way of assigning values to an object, which can be slower due to the method call overhead.
2. **"static" assign**: A more concise syntax that can potentially lead to faster execution due to fewer function calls and checks.

**Pros and Cons**

**`Object.assign()`**:

Pros:

* More readable code
* Easier to debug and maintain

Cons:

* May be slower due to method call overhead
* Can be less efficient in terms of memory allocation

**"static" assign**:

Pros:

* Concise syntax, leading to potentially faster execution
* Less overhead compared to `Object.assign()` method calls

Cons:

* Less readable code
* May lead to more errors or unexpected behavior if not used carefully

Other Considerations:

* The benchmark is running on Firefox 129 and Windows desktop platform.
* Execution frequency is measured in executions per second.

**Alternatives**

If you were to write a similar benchmark, you could consider adding additional test cases, such as:

* Using other object assignment methods like `Object.create()` or `Array.prototype.slice()`.
* Comparing the performance of different browsers or platforms.
* Adding more complex scenarios, like nested objects or arrays.

Keep in mind that this benchmark is designed to compare the performance and readability of two specific approaches, but a more comprehensive benchmark might require additional test cases to cover different scenarios.

Related benchmarks:

Object.assign vs "static" assign (version: 0)

Comparing performance of: Object.assign vs "static" assign

Created: one year ago by: Guest

Jump to the latest result

Object.assign

"static" assign

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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