Benchmark: Delete vs Rest - MeasureThat.net

Script Preparation code:

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

Tests:

Rest
({ a, ...doc } = doc);
Delete
delete doc.a;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Rest
Delete

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**Benchmark Definition and Script Preparation Code**

The provided JSON represents a benchmark definition for a JavaScript microbenchmark. The script preparation code is:
```javascript
var doc = {
    a: 1,
    b: 2,
    c: 3
};
```
This code defines an object `doc` with three properties: `a`, `b`, and `c`, initialized to 1, 2, and 3, respectively.

**Test Cases**

The benchmark has two test cases:

1. **Rest**: This test case is represented by the following JavaScript code:
```javascript
({ a, ...doc } = doc);
```
This code uses the Rest parameter syntax (introduced in ECMAScript 2015) to create a new object with only the `a` property from the original `doc` object. The `...` spread operator (`...`) is used to collect all properties from the `doc` object into an array called `Rest`. This allows us to assign only the `a` property to the new variable.

2. **Delete**: This test case is represented by the following JavaScript code:
```javascript
delete doc.a;
```
This code uses the `delete` operator to remove the `a` property from the `doc` object.

**Options Compared**

In this benchmark, two options are compared:

1. **Rest**: The use of the Rest parameter syntax to create a new object with only the `a` property.
2. **Delete**: The removal of the `a` property using the `delete` operator.

**Pros and Cons**

**Rest:**

Pros:

* More memory-efficient, as it creates a new object with only the required properties.
* Can be more efficient in terms of execution time, as it avoids the need to clone or copy the original object.

Cons:

* Requires support for ECMAScript 2015 (or later) features.
* May not work correctly if the `a` property is not the first property in the `doc` object.

**Delete:**

Pros:

* Widely supported across most browsers and environments.
* Does not require additional features or syntax beyond what's commonly used in JavaScript.

Cons:

* Can be slower, as it involves removing a property from the original object.
* May create memory issues if the `a` property is large or deeply nested.

**Library**

None of the test cases use any external libraries. The benchmark relies solely on built-in JavaScript features and syntax.

**Special JS Feature/Syntax**

The Rest parameter syntax (introduced in ECMAScript 2015) is used in the **Rest** test case. This feature allows for more concise and expressive code, but may not be supported by older browsers or environments.

**Alternative Approaches**

Other alternatives could include:

1. Using a library like Lodash to clone or copy the `doc` object instead of using Rest.
2. Using a different approach, such as assigning the value of `a` directly from `doc` to a new variable (e.g., `const result = doc.a;`) and then removing the property from the original object.

However, these alternatives may not provide significant benefits over the existing implementation and might even increase complexity or introduce additional dependencies.

Related benchmarks:

Delete vs Rest (version: 0)

Comparing performance of: Rest vs Delete

Created: 3 years ago by: Guest

Jump to the latest result

Rest

Delete

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):