Benchmark: Delete vs destructure for objects without mutating pedro

Script Preparation code:

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

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
delete - assign
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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**Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks, providing insight into the performance of different approaches in various browsers.

**Benchmark Definition JSON**

The provided benchmark definition JSON represents a test case named "Delete vs destructure for objects without mutating pedro". The test aims to measure the performance of two approaches:

1. **"delete obj.a"`**: This approach uses the `delete` operator to remove the property `a` from the object `obj`.
2. **"const { a, ...rest } = obj;"** : This approach uses destructuring assignment to create a new object `rest` without modifying the original object.

**Options Compared**

The two options being compared are:

* **Delete**: Uses the `delete` operator to remove a property from an object.
* **Destructuring Assignment**: Uses destructuring assignment to create a new object without modifying the original object.

**Pros and Cons of Each Approach**

*   **Delete**:
    *   Pros:
        *   Simple and straightforward approach
        *   Does not require creating a new object or using advanced syntax
    *   Cons:
        *   Can be slower due to the overhead of the `delete` operator
        *   May have performance implications in certain browsers or situations (e.g., when working with large objects)
*   **Destructuring Assignment**:
    *   Pros:
        *   More efficient than the `delete` approach, as it avoids the overhead of creating a new object
        *   Can be faster due to the compiler optimizations applied by modern JavaScript engines
    *   Cons:
        *   Requires understanding and applying the destructuring syntax
        *   May not work in older browsers or versions that do not support this feature

**Library Usage**

The benchmark uses no explicit libraries. It only relies on built-in JavaScript features and standard library functions.

**Special JavaScript Features/Syntax**

This benchmark utilizes:

*   **Destructuring Assignment**: As mentioned earlier, the benchmark tests the performance of using destructuring assignment to create a new object.
*   **Delete Operator**: The `delete` operator is used in the first test case to remove a property from an object.

**Alternative Approaches**

Other alternatives for removing properties from objects without mutating include:

1.  Using the `Object.defineProperty()` method with the `configurable` and `enumerable` properties set to false.
2.  Using a library like Lodash's `deleteProperty()` function.
3.  Implementing a custom function that iterates over the object's properties and removes them.

However, these alternatives are not typically used in production code due to their complexity or performance implications.

Related benchmarks:

Delete vs destructure for objects without mutating pedro (version: 0)

Measure the performance of delete versus removing a prop from an object without mutating

Comparing performance of: delete - assign vs Rest object

Created: 3 years ago by: Guest

Jump to the latest result

delete - assign

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):