Benchmark: Object.assign vs spread operator irekqq

Tests:

Object.assign
var params = { b:"hello", c: true, d:7 }; var other = Object.assign({}, params);
spread operator
var params = { b:"hello", c: true, d:7 }; const obj = {}; var other = { obj, ...params };

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.assign
spread operator

Fastest: N/A

Slowest: N/A

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

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Let's break down what's being tested in this benchmark.

**What is being tested?**

The provided JSON represents two individual test cases, each testing the performance of JavaScript methods for creating and modifying objects: `Object.assign()` and the spread operator (`...`).

In the first test case, an object `params` is created with three properties: `b`, `c`, and `d`. The object is then passed to `Object.assign()`, which copies the values from `params` into a new object called `other`. In contrast, the second test case uses the spread operator (`...`) to create a new object `obj` and assign the values from `params` to its properties.

**Options compared**

The two options being tested are:

1. **Object.assign()**: A built-in JavaScript method that copies the values of an object into a new object.
2. **Spread operator (`...`)**: A feature introduced in ECMAScript 2018 that allows objects to be created using the syntax `const obj = { ...obj, ...params };`.

**Pros and cons**

**Object.assign()**:

Pros:

* Widely supported across browsers and Node.js versions
* Can handle nested objects and arrays

Cons:

* Has a higher performance overhead compared to the spread operator
* Requires an extra function call (e.g., `Object.assign({}, params)`)

**Spread operator (`...`)**:

Pros:

* Faster than `Object.assign()` for simple object assignments
* More readable and concise code syntax
* Supports nested objects and arrays

Cons:

* Not as widely supported across browsers and Node.js versions (although most modern ones support it)
* Can be less intuitive for complex object assignments

**Library usage**

In the benchmark, none of the test cases use any external libraries. However, if we were to analyze the code, `Object.assign()` is a built-in JavaScript method that doesn't require any libraries.

**Special JS feature or syntax**

The spread operator (`...`) was introduced in ECMAScript 2018 and is a relatively new feature. It's supported by most modern browsers and Node.js versions but may not work in older environments.

**Other alternatives**

If you wanted to test alternative methods for creating objects, you could consider the following:

1. **Object.create()**: Creates an object with the specified prototype.
2. **Array.prototype.slice.call()**: Converts an array to an object using `slice()` and `call()`.
3. **JSON.parse(JSON.stringify())**: Creates a deep copy of an object by parsing its JSON representation.

Keep in mind that these alternatives may have different performance characteristics, syntax, or requirements for specific use cases.

Related benchmarks:

Object.assign vs spread operator irekqq (version: 0)

Comparing performance of: Object.assign vs spread operator

Created: 6 years ago by: Guest

Jump to the latest result

Object.assign

spread operator

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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