Benchmark: Delete vs destructure for cloned objects

Script Preparation code:

var obj = {
  a: { b: 1 },
  c: 'd',
  e: false
}

Tests:

delete
var obj2 = { ...obj }; delete obj2.c
rest
const { c, ...obj2 } = obj;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
delete
rest

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):

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Let's break down the provided benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is titled "Delete vs destructure for cloned objects". It's asking to measure the performance of two different approaches:

1. **delete**: This approach involves deleting a property from an object using the `delete` keyword.
2. **rest**: This approach involves destructuring an object and extracting its properties into new variables, effectively removing the original property.

**Options Compared**

The benchmark is comparing the performance of these two approaches on an object with three properties: `a`, `c`, and `e`.

**Pros and Cons of Each Approach**

1. **delete**:
	* Pros: Simple and straightforward.
	* Cons: Can be slower than destructuring for large objects, as it involves iterating over the object's property names.
2. **rest**:
	* Pros: Generally faster and more efficient for large objects, as it avoids iterating over property names.
	* Cons: Requires JavaScript 8+ syntax (const and rest parameter), which may not be supported by all browsers.

**Library Used**

In this benchmark, the `...` operator is used to implement destructuring. The `...` operator is a spread operator that extracts properties from an object into new variables. It's part of the ECMAScript 2015 (ES6) standard and is widely supported in modern browsers.

**Special JS Feature/Syntax**

The benchmark uses the `const` keyword, which was introduced in ES6 as well. `const` is used to declare variables that cannot be reassigned.

**Other Considerations**

* The benchmark is measuring the performance of these two approaches on a specific object structure.
* The benchmark may not account for edge cases, such as objects with circular references or large property names.

**Alternatives**

Some alternative approaches to consider:

1. **Object.assign()**: This method can be used to delete properties from an object. However, it's generally slower and less efficient than destructuring.
2. **delete property name**: Instead of using the `delete` keyword, you could use `obj.propertyName = undefined;`. While this works, it may not be as efficient as destructuring.

To run a new benchmark on MeasureThat.net, users would create a new test case with their own script preparation code and HTML preparation code (if needed), and then execute the benchmark to generate results.

Related benchmarks:

Delete vs destructure for cloned objects (version: 0)

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

Comparing performance of: delete vs rest

Created: 5 years ago by: Guest

Jump to the latest result

delete

rest

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):