Benchmark: delete prop object

Script Preparation code:

var person = { name: 'John', age: 23, sex: 'Male' };

Tests:

delete
delete person.age;
undefined
person.age = undefined;
getComputedStyle
parseFloat(getComputedStyle(document.createElement('div')).width)
getPropertyValue()
parseFloat(getComputedStyle(document.createElement('div')).getPropertyValue('width'))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
delete
undefined
getComputedStyle
getPropertyValue()

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.

I'll break down what's being tested in the provided benchmark, and explain the options compared.

**Benchmark Description**

The benchmark measures how fast browsers can delete properties from an object using different methods.

**Options Compared**

There are three options compared:

1. **`delete person.age;`**: This method uses the `delete` keyword to remove the property from the object.
2. **`person.age = undefined;`**: This method sets the property value to `undefined`, which effectively removes it from the object.
3. **`parseFloat(getComputedStyle(document.createElement('div')).width)`**: This test is unrelated to deleting properties and uses a different approach, involving getting the computed style of an element and parsing its width value.

**Pros and Cons**

1. **`delete person.age;`**:
	* Pros: Simple and straightforward.
	* Cons: Not all browsers support this method or may have limitations (e.g., some might not remove the property if it's already `undefined`).
2. **`person.age = undefined;`**:
	* Pros: Widely supported by most browsers, including older ones that might not support `delete`.
	* Cons: May be slower than the `delete` method due to the assignment.
3. **`parseFloat(getComputedStyle(document.createElement('div')).width)`**:
	* Pros: Unrelated to deleting properties, so it's a good "noise" test.
	* Cons: Not relevant to the benchmark's purpose and may skew results.

**Library and Special JS Feature**

None of the tests use any libraries or special JavaScript features beyond what's built-in to the language.

**Other Considerations**

The benchmark is likely intended to measure browser performance in a controlled environment, helping to identify potential optimization opportunities. However, it's essential to note that deleting properties from an object is not a common operation in real-world web development.

**Alternatives**

If you wanted to create a similar benchmark, you could consider adding more tests for different property deletion methods, such as:

* `Object.defineProperty(person, 'age', { value: undefined });`
* `person.age = null;`

These tests would help cover additional scenarios and provide a more comprehensive view of browser performance in this area.

Related benchmarks:

delete prop object (version: 6)

Comparing performance of: delete vs undefined vs getComputedStyle vs getPropertyValue()

Created: 3 years ago by: Registered User

Jump to the latest result

delete

undefined

getComputedStyle

getPropertyValue()

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):