Benchmark: JavaScript spread operator vs Object.assign performance temp

Tests:

Using the spread operator
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = { ...firstObject, ...secondObject };
Using Object.assign
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = {}; Object.assign(finalObject, firstObject, secondObject);
ajostg[pf
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = {}; Object.assign(finalObject, { ...firstObject, ...secondObject });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Using the spread operator
Using Object.assign
ajostg[pf

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

**Overview**

The provided benchmark definition measures the performance of two methods: using the JavaScript spread operator (`...`) and `Object.assign()` to merge two objects into a single object.

**Test Cases**

There are three test cases:

1. **Using the spread operator**: This test case uses the spread operator (`...`) to merge two objects, `firstObject` and `secondObject`, into a single object, `finalObject`. The syntax is: `{ ...firstObject, ...secondObject }`.
2. **Using Object.assign()**: This test case uses the `Object.assign()` method to merge two objects, `firstObject` and `secondObject`, into a single object, `finalObject`. The syntax is: `Object.assign(finalObject, firstObject, secondObject)`.
3. **Invalid/ Missing Test Case**: The third test case appears to be invalid or missing, with an incomplete benchmark definition.

**Library and Purpose**

* No libraries are explicitly mentioned in the benchmark definition.
* However, it's worth noting that the spread operator is a built-in JavaScript feature introduced in ECMAScript 2018 (ES2018), while `Object.assign()` is a native method of the `Object` class since ECMAScript 2009 (ES5).

**Special JS Features or Syntax**

The test cases use the spread operator, which is a relatively recent addition to the JavaScript language. It's a concise way to merge objects, but it may not be supported in older browsers or environments.

**Pros and Cons of Different Approaches**

* **Using the spread operator:**
	+ Pros:
		- Concise syntax
		- Easy to read and write
		- Fast execution time
	+ Cons:
		- Not all browsers support it (older versions of Chrome, Safari, etc.)
		- May not work in older environments or with certain libraries
* **Using Object.assign():**
	+ Pros:
		- Widely supported across different browsers and environments
		- Works with older JavaScript versions
	+ Cons:
		- Longer syntax (more verbose)
		- May be slower execution time compared to the spread operator

**Alternatives**

Other alternatives for merging objects in JavaScript include:

* Using the `lodash` library's `merge()` function or other utility functions.
* Creating a custom merge function using loops and conditional statements.
* Using a different data structure, such as an array of key-value pairs, to represent the merged object.

Keep in mind that the performance difference between these alternatives may be negligible for most use cases. The choice ultimately depends on personal preference, coding style, and specific requirements.

**Additional Considerations**

When creating benchmarks like this one, consider the following:

* Use a representative dataset of inputs to ensure accurate results.
* Ensure the benchmark is representative of real-world scenarios or edge cases.
* Run multiple iterations for each test case to account for any variations in execution time.
* Document and report the results clearly, including any limitations or caveats.

Related benchmarks:

JavaScript spread operator vs Object.assign performance temp (version: 0)

Comparing performance of: Using the spread operator vs Using Object.assign vs ajostg[pf

Created: 5 years ago by: Guest

Jump to the latest result

Using the spread operator

Using Object.assign

ajostg[pf

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):