Benchmark: a.b = null vs delete a.b

Tests:

= null
for (let i = 0; i < 1000; i++) { const a = {b: 200} a.b = null }
delete
for (let i = 0; i < 1000; i++) { const a = {b: 200} delete a.b }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
= null
delete

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark is defined by the JSON object:

```
{
  "Name": "a.b = null vs delete a.b",
  "Description": null,
  "Script Preparation Code": null,
  "Html Preparation Code": null
}
```

This indicates that two different approaches are being compared: assigning `null` to a property (`a.b = null`) and using the `delete` operator to remove the property (`delete a.b`). The goal of this benchmark is likely to measure the performance difference between these two approaches.

**Options Compared**

The two options being compared are:

1. **Assignment with `null`**: This involves assigning the value `null` to the `b` property of an object `a`.
2. **Use of `delete` operator**: This involves using the `delete` operator to remove the `b` property from the object `a`.

**Pros and Cons**

1. **Assignment with `null`**:
	* Pros: Simple and widely supported. Assigning a value to a non-existent property can be faster than deleting it.
	* Cons: May not work correctly in all cases, such as when used within loops or inside functions.
2. **Use of `delete` operator**:
	* Pros: More efficient and safer than assignment with `null`, as it does not create a new reference to the property.
	* Cons: Requires the use of `delete`, which can be less familiar to some developers.

**Library/Function Usage**

There is no explicit library or function usage mentioned in this benchmark. However, it's worth noting that both assignment and deletion can have implications on how JavaScript engines optimize memory management.

**Special JS Feature/Syntax**

This benchmark does not explicitly use any special JavaScript features or syntax beyond the basic `let` declaration and object literals.

**Alternative Approaches**

Other approaches to remove a property from an object might include:

1. **Using a proxy**: Creating a proxy object that traps access to the removed property.
2. **Using a function**: Defining a function that returns an empty object with the same properties as the original object, effectively removing the property.
3. **Using a library**: Utilizing libraries like `lodash` or `core-js` which provide built-in support for removing properties from objects.

Keep in mind that these alternative approaches might have different performance characteristics and use cases compared to the assignment with `null` and `delete` operators being tested in this benchmark.

Related benchmarks:

a.b = null vs delete a.b (version: 0)

Comparing performance of: = null vs delete

Created: 2 years ago by: Guest

Jump to the latest result

= null

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):