Benchmark: Unset vs Delete - MeasureThat.net

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>

Script Preparation code:

var o = {a:1,b:2,c:3,d:4}

Tests:

Unset
_.unset(o)
Delete
delete o

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Unset
Delete

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 120 on Android

View result in a separate tab

Unset

4.5M/s

Delete

2.3M/s

View exact numbers

Test name	Executions per second
✓ Unset	4,486,070 Ops/sec
Delete	2,259,733 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 JSON and explain what is being tested.

**Benchmark Definition**

The benchmark definition provides metadata about the test case, including:

* `Name`: The name of the benchmark, which in this case is "Unset vs Delete".
* `Description`: A brief description of the test case.
* `Script Preparation Code`: A JavaScript code snippet that prepares the environment for the test. In this case, it creates an object `o` with four properties (`a`, `b`, `c`, and `d`) and assigns values to them (1, 2, 3, and 4, respectively).
* `Html Preparation Code`: An HTML code snippet that includes a reference to the Lodash library. This is likely used for the benchmarking tool to execute the test cases.

**Individual Test Cases**

The individual test cases are defined in an array of objects, each with two properties:

* `Benchmark Definition`: A string that defines the specific JavaScript operation being tested. In this case, there are two test cases:
	+ "_.unset(o)": This test case uses the Lodash library's `_unset` function to unset a property on the object `o`.
	+ "delete o": This test case uses the native JavaScript `delete` operator to delete a property from the object `o`.

**Libraries and Features**

The benchmarking tool appears to use the Lodash library, which is a popular utility library for JavaScript. The `_unset` function in this context likely provides a way to unset a property on an object without modifying its prototype chain.

There are no special JS features or syntax mentioned in the provided code snippets.

**Pros and Cons of Different Approaches**

The two test cases differ in how they manipulate the object `o`. Here's a brief analysis of each approach:

* **_.unset(o)**:
	+ Pros: This approach uses the Lodash library, which provides a way to unset properties on objects without modifying their prototype chain. This can be more efficient and safe than using the native `delete` operator.
	+ Cons: The benchmarking tool needs to include the Lodash library in its execution environment, which may add extra complexity and overhead.
* **delete o**:
	+ Pros: This approach is a standard part of JavaScript, so no additional libraries are required. It's also more straightforward to implement and understand.
	+ Cons: This approach can modify the object's prototype chain if it has other properties with the same name, which might affect performance or behavior in certain situations.

**Other Considerations**

When benchmarking these two approaches, consider factors like:

* Performance overhead of including Lodash libraries
* Efficiency of unset vs delete operations on objects with multiple properties
* Behavior and potential issues related to prototype chain modifications

**Alternative Approaches**

If the developers wanted to explore alternative approaches or compare other methods for unsetting or deleting properties from an object, some possible options could include:

* Using `Object.defineProperty` and `Object.getOwnPropertyDescriptor` to manipulate property descriptors.
* Implementing a custom `unset` function using bitwise operations to clear property flags.
* Using a different library, such as Underscore.js, which provides similar functionality.

These alternative approaches would require careful consideration of the trade-offs in terms of performance, safety, and maintainability.

Unset vs Delete (version: 0) Benchmark.js

Test the difference between unset vs delete

Comparing performance of: `Unset vs Delete`

Created: 4 years ago by: Guest

Go to the latest result

Unset

Delete

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Unset vs Delete (version: 0) Benchmark.js

Test the difference between unset vs delete

Comparing performance of: Unset vs Delete

Created: 4 years ago by: Guest

Go to the latest result

Unset

Delete

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

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Comparing performance of: `Unset vs Delete`