Benchmark: test2 delete - MeasureThat.net

Script Preparation code:

var o = { p1: "p1", p2: "p2" };

Tests:

delete o.p
delete o.p1; delete o.p2;
o.p = undefined
o.p1 = o.p2 = undefined;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
delete o.p
o.p = undefined

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36

Browser/OS: Chrome 90 on Windows

View result in a separate tab

Test name	Executions per second
delete o.p	5519232.5 Ops/sec
o.p = undefined	3128850.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark and explain what's being tested, compared options, pros and cons, and other considerations.

**Benchmark Definition**

The benchmark is defined by two test cases:

1. `delete o.p1; delete o.p2;` (Test Name: `delete o.p`)
2. `o.p1 = o.p2 = undefined;` (Test Name: `o.p = undefined`)

The script preparation code for both tests is the same:
```javascript
var o = { p1: "p1", p2: "p2" };
```
This creates an object `o` with two properties, `p1` and `p2`, initialized with string values.

**What's being tested?**

These benchmarks test the performance of JavaScript's deletion mechanisms for objects. The tests compare two different approaches:

1. **Delete individual properties**: `delete o.p1; delete o.p2;`
This approach deletes each property individually, which may lead to slower execution due to the overhead of deleting a single property and then checking if it exists.
2. **Delete entire object**: `o.p1 = o.p2 = undefined;`

**Options compared**

The two test cases compare:

* Delete individual properties (Test Name: `delete o.p`)
* Delete entire object (Test Name: `o.p = undefined`)

**Pros and Cons of each approach**

1. **Delete individual properties (Test Name: delete o.p)**:
	* Pros:
		+ Less memory is freed when deleting individual properties.
		+ May be faster due to less overhead.
	* Cons:
		+ Requires two separate `delete` statements, which can lead to slower execution.
2. **Delete entire object (Test Name: o.p = undefined)**:
	* Pros:
		+ Faster execution since only one operation is required to delete the entire object.
	* Cons:
		+ More memory is freed when deleting the entire object.
		+ May lead to slower performance if the object is very large.

**Other considerations**

The benchmark measures the number of executions per second for each test case, which indicates the speed at which the JavaScript engine can execute these operations. A higher value indicates faster execution.

**Library and special features used**

No libraries or special JavaScript features are mentioned in the provided code or documentation.

**Alternatives**

If you want to create a similar benchmark, consider adding additional test cases that cover other aspects of object deletion, such as:

* Deleting properties with different data types (e.g., `delete o.p1 = "string";`)
* Deleting properties using `Object.prototype.hasOwnProperty.call()`
* Comparing the performance of different JavaScript engines or versions

Keep in mind that benchmarking is an iterative process, and you may need to refine your tests and adjust your expectations based on the results.

Related benchmarks:

test2 delete (version: 0)

Comparing performance of: delete o.p vs o.p = undefined

Created: 3 years ago by: Guest

Jump to the latest result

delete o.p

o.p = undefined

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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