Benchmark: Object defineProperty

Tests:

defineProperty
var obj = {}; Object.defineProperty(obj, '$i', {enumerable:false, value:true});
Raw access
var obj = {}; obj.$i = true;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
defineProperty
Raw access

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36

Browser/OS: Chrome 143 on Windows

View result in a separate tab

Test name	Executions per second
defineProperty	16064327.0 Ops/sec
Raw access	251802576.0 Ops/sec

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's being tested, the options compared, pros and cons, and other considerations.

**Benchmark Definition**

The benchmark definition represents a piece of JavaScript code that creates an object with a property called `$i` using two different methods:

1. `Object.defineProperty(obj, '$i', { enumerable: false, value: true });`
2. `var obj = {}; obj.$i = true;`

These two methods are compared to measure their performance.

**Options Compared**

The two options being compared are:

1. **Using `Object.defineProperty()`**: This method is a part of the JavaScript Object Model (JSOM) and allows you to define properties on an object in a more explicit and flexible way.
2. **Direct Property Assignment**: This method assigns a value directly to a property without using any additional functions or methods.

**Pros and Cons**

1. **Using `Object.defineProperty()`**:
	* Pros:
		+ More explicit and flexible way of defining properties.
		+ Provides better control over property metadata (e.g., enumerability, writable, configurable).
	* Cons:
		+ Can be slower due to the overhead of calling a function.
2. **Direct Property Assignment**:
	* Pros:
		+ Faster and more lightweight.
	* Cons:
		+ Less explicit and less flexible than `Object.defineProperty()`.
		+ May lead to unexpected behavior if not used carefully.

**Other Considerations**

1. **Library Usage**: Neither of the options uses any external libraries. However, it's worth noting that some browsers may have additional features or APIs that might affect performance.
2. **Special JS Features/Syntax**: There are no special JavaScript features or syntax being tested here.

**Alternative Approaches**

Other alternatives could include:

1. Using `Object.create()` instead of `var obj = {}`.
2. Using `Object.defineProperty()` with different metadata options (e.g., writable, configurable).
3. Comparing performance using a different property name or data type.
4. Adding additional operations before or after the property assignment to simulate real-world scenarios.

Keep in mind that these alternatives would require modifications to the benchmark definition and may not be relevant to this specific test case.

Related benchmarks:

Object defineProperty (version: 0)

Comparing performance of: defineProperty vs Raw access

Created: 9 years ago by: Guest

Jump to the latest result

defineProperty

Raw access

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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