Benchmark: Delete vs Destructure (Objects)

Script Preparation code:

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

Tests:

Delete
delete obj.a delete obj.b console.log(JSON.stringify(obj, null, 4));
Destructure
var { a, b, ...rest } = obj; console.log(JSON.stringify(obj, null, 4));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Delete
Destructure

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:124.0) Gecko/20100101 Firefox/124.0

Browser/OS: Firefox 124 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
Delete	151127.9 Ops/sec
Destructure	156754.4 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into explaining the provided benchmark.

**Benchmark Overview**

The benchmark measures the performance of two approaches to delete or remove properties from an object in JavaScript: using the `delete` keyword and destructuring with the spread operator (`...`). The test case uses a simple object with three properties: `a`, `b`, and `c`.

**Options Compared**

There are two options being compared:

1. **Delete**: Using the `delete` keyword to remove properties from an object.
2. **Destructure**: Using destructuring with the spread operator (`...`) to create a new object without the deleted properties.

**Pros and Cons of Each Approach**

### Delete

Pros:

* Simple and straightforward syntax
* Well-supported by most JavaScript implementations

Cons:

* Can cause unexpected behavior if not used carefully (e.g., deleting an array property can remove all elements)
* Can lead to object reference counting issues in certain situations

### Destructure

Pros:

* Creates a new object without modifying the original
* More concise and expressive syntax
* Can be more efficient than `delete` for large objects

Cons:

* Requires understanding of destructuring syntax (introduced in ECMAScript 2015)
* May not work as expected if the property name is a reserved word or a function name

**Library and Purpose**

There is no explicit library mentioned, but it's likely that the benchmark uses built-in JavaScript features for both options.

**Special JS Features/Syntax**

Neither of the test cases uses any special JavaScript features or syntax beyond the standard `delete` keyword and destructuring with the spread operator.

**Other Alternatives**

If you're looking for alternatives to these two approaches, consider:

* Using a library like Lodash's `omit()` function, which can remove properties from an object without modifying it.
* Using a JSON schema validation library, which can help enforce data integrity and consistency across different JavaScript implementations.

In summary, the benchmark provides a simple yet informative comparison between using the `delete` keyword and destructuring with the spread operator to delete or remove properties from objects in JavaScript. The results highlight the performance differences between these two approaches, providing insights for developers who need to optimize their code for performance or other considerations.

Related benchmarks:

Delete vs Destructure (Objects) (version: 0)

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

Comparing performance of: Delete vs Destructure

Created: 6 years ago by: Guest

Jump to the latest result

Delete

Destructure

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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