Benchmark: delete vs destructuring

Script Preparation code:

var data = {
    "id": 1,
    "name": "Leanne Graham",
    "username": "Bret",
    "email": "Sincere@april.biz",
    "address": {
      "street": "Kulas Light",
      "suite": "Apt. 556",
      "city": "Gwenborough",
      "zipcode": "92998-3874",
      "geo": {
        "lat": "-37.3159",
        "lng": "81.1496"
      }
    },
    "phone": "1-770-736-8031 x56442",
    "website": "hildegard.org",
    "company": {
      "name": "Romaguera-Crona",
      "catchPhrase": "Multi-layered client-server neural-net",
      "bs": "harness real-time e-markets"
    }
  }

Tests:

delete
delete data.name delete data.company
destructuring
const { name, company, ...newData } = data;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
delete
destructuring

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 break down the benchmark definition and test cases to understand what is being tested.

**Benchmark Definition JSON**

The website uses a JSON object to define the benchmark, which includes:

* `Name`: The name of the benchmark, "delete vs destructuring".
* `Description`: A brief description of the benchmark, also "delete vs destructuring".
* `Script Preparation Code`: A JavaScript code snippet that creates an object `data` with nested properties. This object will be used as input for the test cases.
* `Html Preparation Code`: An empty string, indicating no HTML preparation is needed.

**Test Cases**

The website defines two individual test cases:

1. **delete**: The benchmark definition includes a JavaScript statement `delete data.name`, which deletes the property `name` from the object `data`. This test case measures the performance of deleting a single property.
2. **destructuring**: The benchmark definition includes another JavaScript statement `const { name, company, ...newData } = data;`, which uses destructuring to extract properties `name` and `company` from the object `data` and assigns them to new variables `name` and `company`. This test case measures the performance of using destructuring.

**Options Compared**

The benchmark compares two different approaches:

1. **delete**: Deletes a single property (`name`) from the object `data`.
2. **destructuring**: Uses destructuring to extract properties (`name` and `company`) from the object `data`.

**Pros and Cons**

* **delete**:
	+ Pros: Simple, straightforward operation.
	+ Cons: May trigger additional checks or optimizations in some browsers.
* **destructuring**:
	+ Pros: Can be more efficient than using `delete`, as it reuses existing variable assignments.
	+ Cons: Requires a more complex syntax and may not be supported by all browsers.

**Library Used**

There is no explicit library mentioned in the benchmark definition. However, JavaScript engines typically use internal optimizations and checks that can affect performance. The `delete` operator might trigger additional checks or optimizations in some browsers, while destructuring using `const { name, company, ...newData } = data;` may not be subject to these checks.

**Special JS Feature or Syntax**

The benchmark uses a JavaScript feature called "spread syntax" (`...newData`) introduced in ECMAScript 2018. This feature allows extracting properties from an object using the spread operator. While this feature is widely supported, some older browsers might not support it.

**Other Alternatives**

If you wanted to compare these two approaches using alternative methods, you could consider:

* Using `Object.defineProperty()` or `Object.prototype.hasOwnProperty.call()` to delete a property.
* Creating a temporary variable to store the result of the destructuring operation and assigning it to a new variable.
* Using `for...in` loop to iterate over the object's properties and delete them individually.

Keep in mind that these alternatives may have different performance characteristics or even require additional setup.

Related benchmarks:

delete vs destructuring (version: 0)

delete vs destructuring

Comparing performance of: delete vs destructuring

Created: 3 years ago by: Guest

Jump to the latest result

delete

destructuring

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):