Benchmark: delete test - MeasureThat.net

Script Preparation code:

var o = {}; o.p = "";

Tests:

delete o.p;
delete o.p;
o.p = undefined;
o.p = 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: 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

Browser/OS: Chrome 131 on Windows

View result in a separate tab

Test name	Executions per second
delete o.p;	41853600.0 Ops/sec
o.p = undefined;	20625994.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definition and test cases to explain what's being tested.

**Benchmark Definition**

The benchmark definition is a JSON object that contains information about the script to be executed, including:

* `Script Preparation Code`: This code is executed in the browser before running the actual benchmark. In this case, it creates an empty object `o` and assigns an empty string to its property `p`. This suggests that the test is checking how quickly the browser can delete or modify a property on an object.
* `Html Preparation Code`: This field is empty, which means no additional HTML code needs to be executed before running the benchmark.

**Individual Test Cases**

There are two individual test cases:

1. **delete o.p;**: This test case checks how fast the browser can execute the JavaScript instruction `delete o.p;`. The `delete` keyword in JavaScript is used to delete a property from an object.
2. **o.p = undefined;**: This test case checks how fast the browser can execute the JavaScript instruction `o.p = undefined;`. This assignment operation is used to set a property of an object to `undefined`.

**Options Compared**

In this benchmark, two options are being compared:

1. Using `delete` keyword to delete a property (`delete o.p;`)
2. Using assignment operator (`=`) to set the value of a property to `undefined` (`o.p = undefined;`)

**Pros and Cons**

* **Using `delete` keyword:**
	+ Pros:
		- More efficient way to delete properties from objects, as it directly removes the reference to the property.
	+ Cons:
		- Some older browsers might not support this syntax or might behave unexpectedly.
* **Using assignment operator (`=`):**
	+ Pros:
		- Widely supported across different browsers and versions.
	+ Cons:
		- Requires an additional operation to set the value of the property to `undefined`, which can be slower than deleting the property directly.

**Library**

There is no explicit library mentioned in the benchmark definition. However, since JavaScript objects are being used, it's likely that the benchmark assumes a standard JavaScript environment with built-in object methods like `delete`.

**Special JS Feature or Syntax**

The `delete` keyword and assignment operator (`=`) are both standard JavaScript features, but their behavior can vary across different browsers and versions.

**Other Alternatives**

For testing similar benchmarks, you might want to consider other approaches:

1. Using a different method to delete properties, such as using the `Object.keys()` and `Array.prototype.forEach()` methods or leveraging browser-specific APIs like WebAssembly (if applicable).
2. Testing assignment operations with different values, such as numbers, strings, or booleans, to see how performance varies.
3. Adding more complex object structures and relationships to better simulate real-world scenarios.

Keep in mind that the specific benchmark design and test cases can greatly influence the results and insights derived from running them on various JavaScript environments.

Related benchmarks:

delete test (version: 0)

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

Created: 5 years ago by: Guest

Jump to the latest result

delete o.p;

o.p = undefined;

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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