Benchmark: Delete vs destructure for objects v2

Script Preparation code:

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

Tests:

delete
delete obj.a
Rest object
const { a, ...rest } = obj; const newObj = { ...rest };

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:

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

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Let's dive into explaining the provided benchmark.

**What is being tested?**

The benchmark measures the performance of two different approaches in JavaScript:

1. `delete obj.a`: This approach uses the `delete` keyword to delete a property from an object.
2. `const { a, ...rest } = obj; const newObj = { ...rest };`: This approach uses destructuring assignment to remove a property from an object.

**Options being compared**

The benchmark compares the performance of these two approaches:

* `delete` keyword
* Destructuring assignment with object spread (`{ ...rest }`)

**Pros and Cons of each approach:**

1. `delete` keyword:
	* Pros:
		+ Simple and concise syntax.
		+ Works on most modern JavaScript engines, including those that support dynamic property deletion (e.g., V8).
	* Cons:
		+ Not supported in older JavaScript versions (pre ES6) or environments with limited support for dynamic property deletion.
		+ May not be as efficient as other approaches, especially when dealing with large objects.
2. Destructuring assignment with object spread (`{ ...rest }`):
	* Pros:
		+ More expressive and flexible syntax, allowing for more control over the resulting object.
		+ Can be used in combination with other destructuring patterns (e.g., `const { a, b, ...rest } = obj;`).
	* Cons:
		+ Requires support for ES6 destructuring assignment, which may not be available in older browsers or environments.
		+ May generate more code than the `delete` keyword approach.

**Other considerations:**

* The benchmark does not account for potential side effects of modifying an object's properties (e.g., changes to other properties or the object itself).
* It's worth noting that these approaches may have different performance characteristics depending on the specific use case and environment.

**Library/dependency usage**

There is no explicit library or dependency mentioned in the benchmark definition. However, the `delete` keyword approach relies on the JavaScript engine's support for dynamic property deletion, which may involve internal library dependencies.

**Special JS feature or syntax**

The benchmark uses a special JavaScript feature: destructuring assignment with object spread (`{ ...rest }`). This is an ES6 feature that allows creating new objects by spreading properties from an existing object.

In summary, the benchmark tests the performance of two different approaches in JavaScript:

* The `delete` keyword approach
* Destructuring assignment with object spread

The pros and cons of each approach are outlined above. Understanding these differences can help software engineers choose the most efficient and suitable approach for their specific use case.

Related benchmarks:

Delete vs destructure for objects v2 (version: 0)

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

Comparing performance of: delete vs Rest object

Created: 3 years ago by: Guest

Jump to the latest result

delete

Rest object

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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