Benchmark: Delete vs rest nokk3r

Script Preparation code:

var obj = {
    a: 1,
    b: 2,
    c: 3,
    d: 4,
    f: 5
}

Tests:

delete obj.a
delete obj.a
rest obj.a
const {b,c,d,f, ...rest} = obj

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
delete obj.a
rest obj.a

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:124.0) Gecko/20100101 Firefox/124.0

Browser/OS: Firefox 124 on Linux

View result in a separate tab

Test name	Executions per second
delete obj.a	101521656.0 Ops/sec
rest obj.a	38299000.0 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 and explain what's being tested, compared, and other considerations.

**Benchmark Overview**

The benchmark is designed to measure the performance difference between two approaches for deleting or extracting properties from an object in JavaScript.

**Script Preparation Code**

The script preparation code defines a single object `obj` with five properties: `a`, `b`, `c`, `d`, and `f`. This object will be used as input for the benchmark tests.

**Html Preparation Code**

There is no HTML preparation code provided, so we can assume that this benchmark only tests JavaScript code in isolation, without considering any HTML or DOM-related factors.

**Individual Test Cases**

The benchmark has two individual test cases:

1. `delete obj.a`: This test case deletes the property `a` from the `obj` object using the `delete` keyword.
2. `const {b,c,d,f, ...rest} = obj`: This test case extracts all properties from the `obj` object except for the ones specified in the rest pattern (`{b,c,d,f, ...rest}`), and assigns them to a new object.

**Comparison of Approaches**

The two approaches being compared are:

1. **Delete**: The `delete` keyword is used to delete a property directly.
2. **Rest Pattern**: A rest pattern (`...`) is used to extract all properties except the ones specified in the pattern.

**Pros and Cons of Each Approach:**

1. **Delete**:
	* Pros:
		+ Simple and easy to read.
		+ Directly deletes the property, avoiding any additional overhead.
	* Cons:
		+ Can be slower due to the direct deletion process.
2. **Rest Pattern**:
	* Pros:
		+ More concise and expressive way of extracting properties.
		+ Avoids the need for a separate `delete` keyword.
	* Cons:
		+ May have additional overhead due to the pattern matching process.

**Other Considerations:**

* The benchmark assumes that both approaches are equally efficient, which may not always be the case in practice. In some cases, using `delete` might be faster or more convenient.
* Using rest patterns can make code easier to read and maintain, especially when working with complex objects.
* The benchmark does not consider any potential issues with property names containing special characters or edge cases.

**Library Used:**

There is no library explicitly mentioned in the benchmark. However, it's possible that some implementation details may rely on browser-specific features or built-in methods (e.g., `Object.keys()`, `Object.values()`).

**Special JS Feature/ Syntax:**

The benchmark uses a feature of JavaScript called "rest patterns" (`...`), which was introduced in ECMAScript 2015. This allows for more concise and expressive way of extracting properties from objects.

**Alternatives:**

If you want to create similar benchmarks, consider using other approaches such as:

* Using `Object.defineProperty()` or `Object.defineProperties()` to manipulate object properties.
* Using a library like Lodash or Ramda for functional programming and property extraction.
* Creating custom solutions that take advantage of browser-specific features or built-in methods.

Keep in mind that the performance differences between these approaches can vary depending on the specific use case, JavaScript engine, and platform.

Related benchmarks:

Delete vs rest nokk3r (version: 0)

Comparing performance of: delete obj.a vs rest obj.a

Created: 2 years ago by: Registered User

Jump to the latest result

delete obj.a

rest obj.a

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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