Benchmark: object vs array destructuring assignment

Tests:

object
const {0:a,1:b,2:c} = [1,2,3]
array
const [a,b,c] = [1,2,3]

Historical Performance Data aggregated from 14 community runs

Desktop Results:

Chrome 9 runs

array

160.5M/s

object

159.6M/s

View exact numbers

✓ array: 160,502,384 ops/sec
• object: 159,627,824 ops/sec

Firefox 5 runs

array

411.8M/s

object

129.7M/s

Fastest: array (3.2x faster)

View exact numbers

✓ array: 411,807,072 ops/sec
• object: 129,733,448 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
object
array

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.0.0 Safari/537.36

Browser/OS: Chrome 148 on Mac OS X 10.15.7

View result in a separate tab

object

279.9M/s

array

277.5M/s

View exact numbers

Test name	Executions per second
✓ object	279,895,392 Ops/sec
array	277,453,248 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's being tested, compared, and considered.

**Benchmark Definition**

The benchmark is defined as an object vs array destructuring assignment. This means that we're comparing two different approaches to destructure data in JavaScript: one using objects (destructured as "const {a, b, c} = {a: 1, b: 2, c: 3}") and the other using arrays (destructured as "const [a, b, c] = [1, 2, 3]").

**Options Compared**

In this benchmark, two options are being compared:

1. **Object Destructuring**: This approach uses objects to destructure data. The syntax is `const {a, b, c} = {a: 1, b: 2, c: 3}`, where the object's properties are assigned to variables.
2. **Array Destructuring**: This approach uses arrays to destructure data. The syntax is `const [a, b, c] = [1, 2, 3]`, where the array elements are assigned to variables.

**Pros and Cons**

Both approaches have their pros and cons:

* **Object Destructuring**:
	+ Pros: Can be more readable for complex object structures.
	+ Cons: Can lead to unnecessary creation of objects in memory, which can impact performance.
* **Array Destructuring**:
	+ Pros: Creates less overhead compared to object destructuring.
	+ Cons: May not be as readable for complex data structures.

**Library and Special JS Feature**

Neither of the tested approaches relies on a specific library or special JavaScript feature. The syntax is standard JavaScript, making it widely supported across browsers and environments.

**Other Considerations**

When writing performance-critical code, developers often consider the following factors:

* Memory allocation: How much memory are we allocating for each approach?
* Looping vs. direct access: Are we using loops to access data (object destructuring), or can we directly access it (array destructuring)?
* Cacheability: How well do the approaches cache their results, potentially impacting performance?

**Alternative Approaches**

Other approaches to destructure data in JavaScript include:

1. **Spread Operator**: `const [a, b, c] = [...{a: 1, b: 2, c: 3}]` (note that this creates a new array)
2. **Object.entries() / Array.prototype.map()**: Converting the object to an array and then using destructuring or looping
3. **Function calls with callbacks**: Using functions as a higher-order function to destructure data

Keep in mind that these alternatives may have different performance characteristics, readability trade-offs, and use cases.

In summary, this benchmark compares two approaches to destructure data in JavaScript: object vs array destructuring. The choice between these approaches depends on the specific requirements of your project, including memory usage, readability, and potential performance benefits.

object vs array destructuring assignment (version: 0)

Comparing performance of: `object vs array`

Created: one year ago by: Guest

Go to the latest result

object

array

Historical Performance Data aggregated from 14 community runs

Desktop Results:

Chrome 9 runs

Firefox 5 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

object vs array destructuring assignment (version: 0)

Comparing performance of: object vs array

Created: one year ago by: Guest

Go to the latest result

object

array

Historical Performance Data aggregated from 14 community runs

Desktop Results:

Chrome 9 runs

Firefox 5 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `object vs array`