Benchmark: Delete vs destructure for objects 2

Script Preparation code:

var obj = {
  a:1,
  b:2,
  c:3
}

Tests:

delete
delete obj.a
Rest object
obj.a = undefined

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
delete
Rest object

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 Edg/131.0.0.0

Browser/OS: Chrome 131 on Windows

View result in a separate tab

Test name	Executions per second
delete	34524028.0 Ops/sec
Rest object	27832478.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided JSON represents a benchmark test on MeasureThat.net, which compares the performance of two approaches to delete or remove properties from an object: using the `delete` keyword and removing a property by setting it to `undefined`.

**Test Cases**

There are two individual test cases:

1. **Delete**: `delete obj.a`
This test case measures the performance of using the `delete` keyword to delete a property from an object.

2. **Rest Object**: `obj.a = undefined`
This test case measures the performance of removing a property by setting it to `undefined`.

**Options Compared**

The two approaches compared are:

* Using the `delete` keyword
* Removing a property by setting it to `undefined`

**Pros and Cons of Each Approach**

1. **Delete Keyword**
	* Pros:
		+ More concise and expressive
		+ Can be faster since it only removes the property reference, not creates a new variable to store its value
	* Cons:
		+ Does not remove the property from the object's internal map (e.g., `obj._deleteProperty(obj, 'a')`)
		+ May cause issues with garbage collection if not used carefully
2. **Remove Property by Setting to Undefined**
	* Pros:
		+ Removes the property from the object's internal map
		+ Can be useful for objects that use a lot of caching or optimization techniques
	* Cons:
		+ More verbose and less expressive than using `delete`
		+ May cause issues with garbage collection if not used carefully

**Library Used**

There is no explicit library mentioned in the provided JSON. However, MeasureThat.net may be using some internal implementation details to measure the performance of these operations.

**Special JS Feature/Syntax (Not Applicable)**

Since neither test case uses any special JavaScript features or syntax beyond basic object manipulation and property deletion, this explanation does not apply.

**Other Alternatives**

Other approaches to deleting properties from objects might include:

* Using a `Map` instead of an object for better performance
* Creating a new object with the desired properties removed
* Using a library like Lodash's `omit` function

Keep in mind that these alternatives may have different performance characteristics and trade-offs depending on the specific use case.

Related benchmarks:

Delete vs destructure for objects 2 (version: 0)

Measure the performance of delete versus removing a prop from an object

Comparing performance of: delete vs Rest object

Created: 4 years ago by: Guest

Jump to the latest result

delete

Rest object

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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