Benchmark: Delete vs destructure for objects 3

Script Preparation code:

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

Tests:

delete
var obj2 = {...obj} delete obj2.a delete obj2.b delete obj2.c
Rest object
const { a, b, c, ...rest } = obj;

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:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.86 YaBrowser/20.8.0.893 Yowser/2.5 Yptp/1.23 Safari/537.36

Browser/OS: Yandex Browser 20 on Mac OS X 10.15.3

View result in a separate tab

Test name	Executions per second
delete	2044204.6 Ops/sec
Rest object	1663829.8 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**What is being tested?**

The provided JSON benchmark measures the performance of two approaches to remove properties from an object:

1. **`delete`**: This approach uses the `delete` keyword to remove properties from the object, which can be implemented using a simple loop or direct access.
2. **Rest Object**: This approach uses destructuring assignment (`{ ... }`) to create a new object with only the desired properties and then assigns it back to the original object.

**Options compared**

The two approaches being compared are:

1. `delete`: Directly removing properties from an object using the `delete` keyword.
Pros:

* Simple and straightforward implementation
* Fast execution time

Cons:

* May not be efficient for large objects due to its overhead
* Limited control over property removal

2. Rest Object: Using destructuring assignment (`{ ... }`) to create a new object with only the desired properties.

Pros:

* More flexible and controlled approach
* Can handle large objects efficiently

Cons:

* More complex implementation compared to `delete`
* May incur additional overhead due to array creation

**Library and purpose**

In this benchmark, there is no explicit library mentioned. However, it's essential to note that the `delete` keyword relies on the JavaScript engine's internal representation of objects and property removal.

The `Rest Object` approach uses a built-in JavaScript feature: destructuring assignment (`{ ... }`). This syntax is used to extract properties from an object into individual variables or new objects, like in this case, where we assign it back to the original object.

**Special JS features or syntax**

In this benchmark, the `Rest Object` approach utilizes:

* Destructuring assignment (`{ ... }`)
* Spread operator (`...`) for object creation

**Alternatives**

If you're looking for alternative approaches, here are a few options:

1. **Array methods**: Instead of using `delete` or destructuring assignment, you could use array methods like `splice()` to remove properties from an object.
2. **Property access with conditional statements**: You can use conditional statements (e.g., `if` statements) in combination with property access (`obj.prop`) to filter and remove properties dynamically.
3. **Library functions**: Depending on the specific requirements, you might consider using a library function like Lodash's `pick()` or `omit()` methods to filter objects.

Keep in mind that each approach has its trade-offs and may not be suitable for all scenarios.

Related benchmarks:

Delete vs destructure for objects 3 (version: 0)

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

Comparing performance of: delete vs Rest object

Created: 4 years ago by: Guest

Jump to the latest result

delete

Rest object

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):