Benchmark: delete vs undefined vs null - 2

Script Preparation code:

test = {
    test: [
      {hello: {msg: 'your mom'}}
    ]
}

Tests:

delete
test.test.forEach(hello => delete hello.msg)
undefined
test.test.forEach(hello => hello.msg = undefined)
null
test.test.forEach(hello => hello.msg = null)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
delete
undefined
null

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.0.0 Safari/537.36

Browser/OS: Chrome 113 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
delete	3356598.2 Ops/sec
undefined	2383172.0 Ops/sec
null	3834703.8 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its test cases.

**Benchmark Definition**

The benchmark is defined by two parts: Script Preparation Code and Html Preparation Code (although Html Preparation Code is empty in this case).

Script Preparation Code:
```javascript
test = {
  test: [
    {hello: {msg: 'your mom'}}
  ]
}
```
This code creates an object `test` with a nested property `hello` that contains another object with a single property `msg` initialized to the string `'your mom'`. This setup is used as a test case to measure the performance of different operations.

Html Preparation Code:
There is no Html Preparation Code provided, so we will ignore it for this explanation.

**Test Cases**

The benchmark consists of three individual test cases:

1. **delete**
```javascript
test.test.forEach(hello => delete hello.msg)
```
This test case uses the `delete` operator to remove the property `msg` from the object `hello`.

2. **undefined**
```javascript
test.test.forEach(hello => hello.msg = undefined)
```
This test case uses the assignment operator (`=`) with the value `undefined` to set the `msg` property of the `hello` object to `undefined`.

3. **null**
```javascript
test.test.forEach(hello => hello.msg = null)
```
This test case uses the assignment operator (`=`) with the value `null` to set the `msg` property of the `hello` object to `null`.

**Options Compared**

The three test cases compare the performance of different approaches:

* **delete**: using the `delete` operator to remove a property
* **undefined**: using the assignment operator with the value `undefined` to set a property to `undefined`
* **null**: using the assignment operator with the value `null` to set a property to `null`

**Pros and Cons**

Here are some pros and cons of each approach:

* **delete**
	+ Pros: concise, efficient
	+ Cons: may not work in all situations (e.g., when used with `Object.defineProperty`)
* **undefined**
	+ Pros: can be useful when setting a property to a default value that will be overwritten later
	+ Cons: creates an unnecessary reference to the original object
* **null**
	+ Pros: sets the property to a specific value without creating a new reference
	+ Cons: may not work well if the property is used elsewhere in the code

**Library and Special JS Features**

There are no libraries or special JavaScript features explicitly mentioned in this benchmark.

**Other Considerations**

When working with objects and properties, it's essential to consider factors like:

* Object references and garbage collection
* Property access and modification mechanisms (e.g., `delete`, assignment operators)
* Edge cases and potential pitfalls

**Alternatives**

For similar benchmarks, you might want to explore other approaches, such as:

* Using the `Object.keys()` and `forEach()` methods instead of `delete`
* Comparing performance with different property access patterns (e.g., dot notation vs. bracket notation)
* Using a loop instead of `forEach()`
* Measuring performance with different data structures or object types

Related benchmarks:

delete vs undefined vs null - 2 (version: 0)

Comparing performance of: delete vs undefined vs null

Created: 4 years ago by: Guest

Jump to the latest result

delete

undefined

null

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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