Benchmark: hasOwnProperty vs Object.keys to check whether an Object is empty

Script Preparation code:

var props = {a:1,b:1,c:1,d:1,e:1,f:1,g:1,h:1,i:1,j:1,k:1,l:1,m:1,n:1,o:1,p:1,q:1,r:1,s:1,t:1,u:1,v:1,w:1,x:1,y:1,z:1};

Tests:

hasOwnProperty
var hasKeys = false; for (var key in props) { if (props.hasOwnProperty(key)) { hasKeys = true; break; } }
Object.keys
var hasKeys = Object.keys(props).length > 0

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
hasOwnProperty
Object.keys

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the provided JSON and benchmark results to understand what is being tested, compared, and what are its pros and cons.

**Benchmark Definition:**

The test aims to compare the performance of two approaches:

1. Using `hasOwnProperty` method: This method checks if an object has a specific property.
2. Using `Object.keys()` method: This method returns an array of a given object's own enumerable property names.

**Script Preparation Code:**

A JavaScript object `props` is created with 26 properties, all set to 1. This object is used as the test subject for both approaches.

**Html Preparation Code:**

There is no HTML code provided, which means that this benchmark focuses solely on the performance of the JavaScript code.

**Individual Test Cases:**

The benchmark defines two individual test cases:

1. **hasOwnProperty**: The test checks if `props` object has at least one key by iterating through its properties using a `for...in` loop and checking if each property exists using `hasOwnProperty`. If a property is found, the `hasKeys` variable is set to `true`.
2. **Object.keys**: The test uses the `Object.keys()` method to get an array of the object's own enumerable property names. It then checks if the length of this array is greater than 0.

**Pros and Cons:**

1. **hasOwnProperty**:
	* Pros:
		+ Simple and straightforward approach.
		+ No additional dependencies required (e.g., no libraries).
	* Cons:
		+ May be slower due to the iteration through properties using `for...in`.
		+ Not as efficient for large objects, as it checks each property individually.
2. **Object.keys**:
	* Pros:
		+ More efficient than `hasOwnProperty` when dealing with large objects, as it returns an array of all keys and then checks its length.
	* Cons:
		+ Requires the `Object.keys()` method to be available (which may not be supported in older browsers).
		+ May have additional dependencies or overhead.

**Library/Third-Party Dependencies:**

None are explicitly mentioned, but `Object.keys()` is a built-in JavaScript method. However, if using this method, it's essential to ensure that the browser or environment supports it.

**Special JS Features/Syntax:**

The benchmark uses the following features:

* `for...in` loop (JavaScript): This syntax allows iterating through an object's properties.
* `hasOwnProperty` method (JavaScript): This method checks if an object has a specific property.
* `Object.keys()` method (JavaScript): This method returns an array of an object's own enumerable property names.

**Alternatives:**

For this specific benchmark, alternatives to the two approaches being compared would be:

1. Using a different iteration approach, such as `for...of` loop or using `Array.prototype.includes()` on an array of keys.
2. Using other methods to check for emptiness, such as `Object.getOwnPropertyNames()`, `Object.getPrototypeOf()`, or `JSON.stringify()`.
3. Using libraries like Lodash's `isEmpty()` function or a custom implementation.

However, these alternatives would likely change the nature of the benchmark and might not be suitable for direct comparison with the original two approaches.

Related benchmarks:

hasOwnProperty vs Object.keys to check whether an Object is empty (version: 0)

Comparing performance of: hasOwnProperty vs Object.keys when checking whether an Object has at least one key.

Comparing performance of: hasOwnProperty vs Object.keys

Created: 4 years ago by: Guest

Jump to the latest result

hasOwnProperty

Object.keys

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):