Benchmark: Delete performance v2

Tests:

removeNullish
const arr = new Array(500000).fill(null).map(() => ({ "item": 42 })) const removeNullish = (obj) => Object.entries(obj).reduce((a, [k, v]) => (v ? ((a[k] = v), a) : a), {}) arr.forEach(object => { object.item = undefined removeNullish(object) })
delete
const arr = new Array(500000).fill(null).map(() => ({ "item": 42 })) arr.forEach(object => { delete object.item })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
removeNullish
delete

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 JSON and explain what is being tested, compared, and the pros/cons of each approach.

**Benchmark Definition**
The benchmark definition consists of two test cases: `delete` and `removeNullish`. Both tests create an array of 500,000 objects with a single property `item`, which is initialized to a specific value. The tests then perform a similar operation on this array:

1. For the `delete` approach, each object in the array has its `item` property deleted directly.
2. For the `removeNullish` approach, an additional function `removeNullish` is used to delete the `item` property from each object. This function uses `Object.entries` and `reduce` to iterate over the object's properties and update them.

**Options Compared**
The two approaches being compared are:

1. **Direct deletion (`delete`)**: This approach directly deletes the `item` property from each object in the array.
2. **Using a custom removal function (`removeNullish`)**: This approach uses an additional function to remove the `item` property from each object, which involves iterating over the object's properties and updating them.

**Pros/Cons**

* **Direct Deletion (`delete`)**:
	+ Pros: Simple, efficient, and likely to be faster since it directly targets the property.
	+ Cons: May not work as expected if the `item` property is nested within another object or has a complex data structure.
* **Using a Custom Removal Function (`removeNullish`)**:
	+ Pros: More flexible, can handle complex data structures, and may be more robust than direct deletion.
	+ Cons: Adds an extra layer of complexity, potentially slower due to the additional function call.

**Library Used**
The `Object.entries` method is used in both test cases. This method returns an array of a given object's own enumerable string-keyed property [key, value] pairs. It is a part of the ECMAScript standard and is widely supported across modern browsers.

**Special JS Feature/Syntax**
There are no special JavaScript features or syntaxes being tested here. The focus is on comparing two different approaches to removing a property from an array of objects.

**Other Alternatives**

If you were to create your own benchmark, you could also consider other approaches, such as:

* Using `forEach` with a callback function to iterate over the array and remove properties
* Utilizing a library like Lodash or Ramda for utility functions (e.g., `_.omit`, `ramda.remove`)
* Comparing performance of using `Array.prototype.map()` vs. iterating over the array manually

Keep in mind that benchmarking can be complex, and results may vary depending on specific use cases, hardware, and software configurations.

I hope this explanation helps!

Related benchmarks:

Delete performance v2 (version: 0)

Comparing performance of: removeNullish vs delete

Created: 4 years ago by: Guest

Jump to the latest result

removeNullish

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):