Benchmark: Delete performance

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 })
Create Array
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), {})

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
removeNullish
delete
Create Array

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:146.0) Gecko/20100101 Firefox/146.0

Browser/OS: Firefox 146 on Windows

View result in a separate tab

Test name	Executions per second
removeNullish	20.9 Ops/sec
delete	27.3 Ops/sec
Create Array	75.6 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring the performance of JavaScript operations is crucial for optimizing web applications and identifying areas where improvements can be made.

**Overview of Benchmark**

The provided benchmark measures the performance of three different approaches:

1. **Delete**: This approach uses the built-in `delete` keyword to remove the `item` property from each object in the array.
2. **RemoveNullish**: This approach uses a custom function (`removeNullish`) to iterate over the objects in the array and only assign values if they are not nullish (i.e., either truthy or an empty string).
3. **Create Array**: This approach creates an array of 500,000 objects with a single property `item` initialized to 42.

**Options Compared**

The benchmark compares the performance of these three approaches:

* **Delete**: Directly deletes the `item` property using the built-in `delete` keyword.
* **RemoveNullish**: Uses a custom function to iterate over the objects and only assign values if they are not nullish.
* **Create Array**: Creates an array with 500,000 objects and assigns a value to each object's `item` property.

**Pros and Cons of Each Approach**

1. **Delete**:
	* Pros: Simple, straightforward, and likely to be the most efficient approach since it uses built-in functionality.
	* Cons: May not handle cases where the property is not present in the object (returns undefined instead).
2. **RemoveNullish**:
	* Pros: Handles nullish values by only assigning values if they are truthy or an empty string.
	* Cons: Uses a custom function, which may incur overhead due to function call and binding costs.
3. **Create Array**:
	* Pros: Allows for easy comparison of object creation performance without affecting the benchmark's result.
	* Cons: Creates a new array with 500,000 objects, which can lead to performance issues.

**Library Used**

None explicitly mentioned in the provided benchmark definition.

**Special JS Features or Syntax**

The `removeNullish` function uses a feature called "rest properties" (e.g., `[k, v]`) and arrow functions (`() => ...`). These features are not specific to this benchmark but are part of modern JavaScript syntax. They provide concise ways to express code, making it easier to read and maintain.

**Other Alternatives**

If you're looking for alternatives or have questions about these approaches:

* **Using `delete` with `in` operator**: Instead of using the built-in `delete` keyword, you can use the `in` operator to check if a property exists before deleting it. This approach might be slower due to the overhead of the `in` operator.

Example:
```javascript
arr.forEach(object => {
  if ('item' in object) {
    delete object['item'];
  }
});
```
* **Using `forEach` with a callback function**: Instead of using `arr.forEach`, you can use an arrow function with a callback to achieve the same result. This approach might be slower due to the overhead of creating and executing a new function.

Example:
```javascript
arr.forEach(object => {
  object.item = undefined;
});
```
Keep in mind that these alternatives may not provide significant performance benefits unless you're dealing with extremely large datasets or performance-critical code.

I hope this explanation helps!

Related benchmarks:

Delete performance (version: 0)

Comparing performance of: removeNullish vs delete vs Create Array

Created: 4 years ago by: Guest

Jump to the latest result

removeNullish

delete

Create Array

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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