Benchmark: Testslkndgldnblkdnbklndlbnalvm

Tests:

Using the spread operator
const firstObject = { sampleData: 'Hello world', a: 1, b: 2, c: '3', d: '4', e: {}, f: [] } const secondObject = { moreData: 'foo bar', g: 5, h: '6', j: null, k: undefined } const finalObject = { ...firstObject, ...secondObject };
Using Object.assign
const firstObject = { sampleData: 'Hello world', a: 1, b: 2, c: '3', d: '4', e: {}, f: [] } const secondObject = { moreData: 'foo bar', g: 5, h: '6', j: null, k: undefined } const finalObject = Object.assign({}, firstObject, secondObject);
Loop
const firstObject = { sampleData: 'Hello world', a: 1, b: 2, c: '3', d: '4', e: {}, f: [] } const secondObject = { moreData: 'foo bar', g: 5, h: '6', j: null, k: undefined } const finalObject = {}; [firstObject, secondObject].forEach(object => Object.entries(object).forEach(([k, v]) => finalObject[k] = v))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Using the spread operator
Using Object.assign
Loop

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 YaBrowser/24.4.0.0 Safari/537.36

Browser/OS: Yandex Browser 24 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Using the spread operator	5012186.5 Ops/sec
Using Object.assign	2909064.8 Ops/sec
Loop	1089858.6 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Overview**

The provided benchmark compares three different approaches to merge two objects in JavaScript:

1. Using the spread operator (`...`)
2. Using `Object.assign()`
3. Using a loop to iterate over the properties of both objects

Each approach is tested with identical input data: two objects, `firstObject` and `secondObject`, containing various types of data (strings, numbers, booleans, null, undefined).

**Benchmark Definition JSON**

The benchmark definition JSON consists of three main parts:

* `"Name"` and `"Description"`: These are arbitrary metadata fields that don't affect the benchmark itself.
* `"Script Preparation Code"`: This is an empty string, indicating that no code needs to be executed before running the benchmark.
* `"Html Preparation Code"`: Also an empty string, suggesting that no HTML setup or cleanup is required.

**Individual Test Cases**

Each test case consists of a single benchmark definition:

* `"Benchmark Definition"`: A JavaScript snippet defining two objects (`firstObject` and `secondObject`) and their merged result using one of the three approaches.
* `"Test Name"`: The name of the test, indicating which approach is being tested (e.g., "Using the spread operator").

**Options Compared**

The benchmark compares the performance of three different approaches to merge two objects:

1. **Spread Operator (`...`)**: This method uses the `...` operator to create a new object with the combined properties from both input objects.
2. **Object.assign()**: This method uses the `Object.assign()` function to merge the properties of two or more objects into one object.
3. **Loop**: This approach iterates over the properties of both objects using `forEach`, assigning each property value to a new object.

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

* **Spread Operator (`...`)**:
	+ Pros: Concise, readable, and efficient.
	+ Cons: May not be supported in older browsers or environments with strict mode enabled.
* **Object.assign()**:
	+ Pros: Widely supported, reliable, and easy to understand.
	+ Cons: Can lead to property loss if objects have conflicting properties (e.g., `a` vs. `x`).
* **Loop**:
	+ Pros: Flexible, allows for manual property handling, but may be less readable.
	+ Cons: More verbose, prone to errors, and can be slower due to the loop overhead.

**Libraries and Special JS Features**

There are no libraries or special JavaScript features mentioned in this benchmark. However, it's worth noting that `Object.assign()` has been a built-in method since ECMAScript 2015 (ES6), making it widely supported across modern browsers and environments.

**Other Alternatives**

If you're interested in exploring alternative approaches to merging objects, some notable methods include:

* Using `JSON.parse(JSON.stringify())` for deep object merging
* Utilizing libraries like Lodash or Ramda for functional programming and data manipulation
* Leveraging modern JavaScript features like computed properties (e.g., getters) or `Object.fromEntries()`

Related benchmarks:

Testslkndgldnblkdnbklndlbnalvm (version: 0)

Comparing performance of: Using the spread operator vs Using Object.assign vs Loop

Created: one year ago by: Guest

Jump to the latest result

Using the spread operator

Using Object.assign

Loop

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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