Benchmark: hasOwnProperty vs hasOwnProperty .call

Script Preparation code:

var a = { k: 'hi', x: 'there!' }
var k = 'x'
var z = Object.prototype.hasOwnProperty

Tests:

a.hasOwnProperty(k)
a.hasOwnProperty(k)
z.call(a, k)
z.call(a, k)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
a.hasOwnProperty(k)
z.call(a, k)

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark is designed to compare two approaches: `a.hasOwnProperty(k)` and `z.call(a, k)`. The purpose of this comparison is likely to determine which approach is faster and more efficient in terms of CPU cycles or memory accesses.

**Options Compared**

Two options are being compared:

1. `a.hasOwnProperty(k)`: This method calls the `hasOwnProperty` function on the object `a`, passing `k` as an argument.
2. `z.call(a, k)`: This method uses a function call syntax to invoke the `hasOwnProperty` function on the object `a`, passing `k` as an argument.

**Pros and Cons**

* **`a.hasOwnProperty(k)`**:
	+ Pros: Shorter syntax, potentially faster due to fewer function calls.
	+ Cons: May not be available in older browsers that don't support `hasOwnProperty`.
* **`z.call(a, k)```**:
	+ Pros: More explicit and clear syntax, allows for browser version-specific implementations of `hasOwnProperty`.
	+ Cons: Longer syntax, potentially slower due to the extra function call.

**Library and Its Purpose**

The `Object.prototype.hasOwnProperty` method is a built-in JavaScript method that checks whether an object has a specific property with the given name. The purpose of this method is to provide a way for objects to implement their own logic for checking property existence without relying on the browser's default behavior.

**Special JS Feature or Syntax**

None mentioned in the benchmark definition, so we'll move on to other considerations.

**Other Considerations**

* **Browser Support**: Both `hasOwnProperty` and `call` are widely supported across modern browsers. However, older browsers might not support `hasOwnProperty`, making `z.call(a, k)` a better choice for cross-browser compatibility.
* **Performance**: The benchmark results suggest that `a.hasOwnProperty(k)` is slightly faster than `z.call(a, k)`. This might be due to the shorter syntax or fewer function calls in the former.

**Alternatives**

Other alternatives to compare these approaches could include:

1. Using a different method for checking property existence, such as `in` or `typeof`.
2. Using a different library or implementation of `hasOwnProperty`, such as a third-party polyfill.
3. Testing with different object sizes or structures to see how the performance difference holds up in more complex scenarios.

Keep in mind that benchmarking JavaScript code can be complex, and results may vary depending on various factors like browser version, platform, and hardware.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.5060.114 Safari/537.36

Browser/OS: Chrome 103 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
a.hasOwnProperty(k)	12933732.0 Ops/sec
z.call(a, k)	8771930.0 Ops/sec

Related benchmarks:

hasOwnProperty vs hasOwnProperty .call (version: 0)

Comparing performance of: a.hasOwnProperty(k) vs z.call(a, k)

Created: 2 years ago by: Guest

Jump to the latest result

a.hasOwnProperty(k)

z.call(a, k)

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):