Benchmark: hasOwnPropertyness

Script Preparation code:

var a = {
    property: 'string'
},
b;

Tests:

hasOwnProperty
if (a.hasOwnProperty('property') && a.property) { b = a.property; }
Not.
b = a.property || false;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
hasOwnProperty
Not.

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

I'd be happy to help explain the benchmark and its results.

**What is being tested?**

The provided benchmark tests two different ways of accessing the `property` value in an object `a`. The first test case, "hasOwnProperty", uses the `hasOwnProperty()` method to check if the property exists in the object. If it does, it then checks if the property has a value using the logical AND operator (`&&`). Finally, it assigns the property's value to variable `b` using the assignment operator (`=`). The second test case, "Not.", uses the nullish coalescing operator (`||`) to provide a default value of `false` if the property is null or undefined.

**Options being compared**

The two options being compared are:

1. Using `hasOwnProperty()` and then checking for the property's existence again using logical operators.
2. Using the nullish coalescing operator (`||`) to provide a default value of `false`.

**Pros and Cons of each approach:**

1. **Using `hasOwnProperty()` and then checking for the property's existence again:**
	* Pros:
		+ Can be more readable, especially when using a more traditional style.
		+ Can help avoid potential errors if the property is added or removed later.
	* Cons:
		+ Requires an extra step, which can increase execution time.
		+ May have performance implications due to the repeated checks.
2. **Using the nullish coalescing operator (`||`):**
	* Pros:
		+ More concise and readable.
		+ Can improve performance by reducing the number of steps required for the operation.
	* Cons:
		+ May be less intuitive for developers without prior experience with this operator.

**Library usage**

There is no specific library being used in these benchmark tests. However, it's worth noting that the `hasOwnProperty()` method is a built-in JavaScript function that can only be accessed when running in a browser or Node.js environment, due to security restrictions.

**Special JS features**

The benchmark uses the nullish coalescing operator (`||`), which is a relatively new feature introduced in ECMAScript 2020 (ES10). This operator provides a concise way to provide a default value for a variable if it's null or undefined. The use of this operator can be beneficial in certain scenarios, but its adoption may still be limited due to the age of the feature.

**Other alternatives**

For testing similar scenarios, other approaches could include:

1. Using a simple property access with `a.property` and checking for existence using `typeof` or `instanceof`.
2. Using a library like Lodash, which provides functions for working with objects, such as `_.has(a, 'property')`.

However, these alternatives may not be as concise or readable as the nullish coalescing operator approach.

I hope this explanation helps you understand the benchmark and its results!

Latest run results:

Run details: (Test run date: 6 years ago)

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:62.0) Gecko/20100101 Firefox/62.0

Browser/OS: Firefox 62 on Ubuntu

View result in a separate tab

Test name	Executions per second
hasOwnProperty	66350064.0 Ops/sec
Not.	113057880.0 Ops/sec

Related benchmarks:

hasOwnPropertyness (version: 0)

Comparing performance of: hasOwnProperty vs Not.

Created: 6 years ago by: Guest

Jump to the latest result

hasOwnProperty

Not.

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):