Benchmark: assign - MeasureThat.net

HTML Preparation code:


<div id=''></div>

Script Preparation code:

var arr = ['', '', ''];

Tests:

comapre
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = {} firstObject[sampleData] = firstObject[sampleData] secondObject[moreData] = secondObject[moreData]
a123
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = Object.assign(firstObject, secondObject);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
comapre
a123

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser/OS: Chrome 132 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
comapre	0.0 Ops/sec
a123	41800916.0 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 MeasureThat.net and explore the JavaScript microbenchmarking.

**Benchmark Definition**

The provided JSON represents a benchmark definition for two test cases: `assign` and `a123`. The `Name`, `Description`, `Script Preparation Code`, and `Html Preparation Code` fields provide context for the benchmark.

Here's what's being tested:

* The `assign` benchmark defines an array with empty strings, assigns a value to each element using bracket notation, and then assigns another value to each element. This is a simple assignment operation.
* The `a123` benchmark uses the `Object.assign()` method to combine two objects: `firstObject` and `secondObject`. The resulting object is stored in the `finalObject`.

**Options Compared**

In both benchmarks, there are different approaches to achieve the same result:

1. **Bracket Notation (`[]`) vs. `Object.assign()`:**
	* Bracket notation involves accessing an array element by its index using square brackets `[]`. This approach can be faster for small arrays since it avoids the overhead of creating a new object.
	* `Object.assign()` is a built-in method that merges two objects into one. It's more verbose but provides better performance for large datasets since it avoids the need to create multiple temporary objects.
2. **Assignment vs. Copying:**
	* In both benchmarks, we're assigning values to array elements or merging objects. However, the `a123` benchmark uses `Object.assign()`, which creates a shallow copy of the original object. This can be beneficial for large datasets since it avoids modifying the original object.

**Pros and Cons**

Here are some pros and cons for each approach:

* **Bracket Notation (`[]`)**
	+ Pros: faster for small arrays, less overhead
	+ Cons: more verbose, may not work well with large datasets or complex data structures
* **`Object.assign()`**
	+ Pros: better performance for large datasets, creates a shallow copy of the original object
	+ Cons: more verbose, may have overhead due to object creation

**Library Usage**

In both benchmarks, no specific libraries are used. However, `Object.assign()` is a built-in method in JavaScript.

**Special JS Features or Syntax**

There aren't any special features or syntax used in these benchmarks. The focus is on simple assignment and object merging.

**Other Considerations**

* **Array size**: For small arrays (e.g., 10-100 elements), bracket notation might be faster.
* **Object size**: For large datasets, `Object.assign()` can provide better performance since it avoids the need to create multiple temporary objects.
* **Browser support**: MeasureThat.net likely tests for compatibility with different browsers and versions.

**Alternatives**

If you want to explore alternative approaches or use different libraries, here are some options:

1. Use other methods for array assignment, such as `Array.prototype.forEach()` or a custom implementation using a loop.
2. Experiment with different object merging algorithms, like `lodash.merge()` or a custom implementation using a library like `underscore`.
3. Compare the performance of different JavaScript engines or platforms (e.g., V8, SpiderMonkey, or Node.js).

Keep in mind that these alternatives might not provide significant performance improvements and should be considered only for educational purposes or specific use cases where performance is critical.

Related benchmarks:

assign (version: 0)

12345

Comparing performance of: comapre vs a123

Created: 6 years ago by: Guest

Jump to the latest result

comapre

a123

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):