Benchmark: Delete vs structuring for objects and recreate obj

Script Preparation code:

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

Tests:

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

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):

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The test case measures the performance of two approaches to remove a property from an object without mutating it:

1. Using `delete` with assignment (`delete obj.a \r\nreturn {...obj};`)
2. Using destructuring assignment (`const { a, ...rest } = obj; \r\nreturn rest;`)

**Delete vs Structuring for Objects and Recreate Obj**

The benchmark is comparing the performance of deleting an object property directly (`delete obj.a`) versus removing the property using structuring and assigning a new object to the original variable's value.

**Options Compared**

* Option 1: `delete` with assignment (`delete obj.a \r\nreturn {...obj};`)
	+ Pros:
		- Simple and straightforward approach.
		- Works well in most cases.
	+ Cons:
		- Can lead to unexpected behavior if the property is not a simple value (e.g., an object).
		- May incur additional overhead due to creating a new object.
* Option 2: Destructuring assignment (`const { a, ...rest } = obj; \r\nreturn rest;`)
	+ Pros:
		- More elegant and efficient approach.
		- Works well for removing properties from objects that contain other values (e.g., objects with functions).
		- Can help prevent unexpected behavior due to the use of destructuring.
	+ Cons:
		- May require a good understanding of destructuring syntax.

**Library Used**

None explicitly mentioned in this test case. However, it's worth noting that some libraries may have additional features or nuances when working with objects and properties removal.

**Special JS Feature or Syntax**

The benchmark utilizes the `const` keyword for variable declarations and the rest operator (`...`) as part of destructuring assignment. These are modern JavaScript features introduced in ECMAScript 2015 (ES6).

**Other Considerations**

* The benchmark measures the performance of removing a property without mutating the original object.
* The `DevicePlatform` and `OperatingSystem` fields indicate that the test was run on a desktop device with Mac OS X 10.15.7.

**Alternatives**

If you're interested in exploring alternative approaches, here are some additional options:

1. Using `Object.assign()` to create a new object without mutating the original: `const newObj = Object.assign({}, obj); return newObj;`
2. Using a library like Lodash's `omit()` function to remove properties from an object.
3. Using a different approach, such as using `for...in` loops or recursion to manipulate objects.

Keep in mind that each alternative may have its own trade-offs and performance implications.

Related benchmarks:

Delete vs structuring for objects and recreate obj (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):