Benchmark: Check if specified obj is DOM Node

Script Preparation code:

var obj = document.createElement('div');

Tests:

obj instanceof Node
var isNode = obj instanceof Node;
obj has nodeName prop
var isNode = !!obj.nodeName;
obj has nodeType prop
var isNode = !!obj.nodeType;
obj has nodeType is greater then 0
var isNode = obj.nodeType > 0;
obj nodeType is not undefined
var isNode = typeof obj.nodeType !== 'undefined';
nodeType prop is in obj
var isNode = 'nodeType' in obj;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
obj instanceof Node
obj has nodeName prop
obj has nodeType prop
obj has nodeType is greater then 0
obj nodeType is not undefined
nodeType prop is in obj

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser/OS: Chrome 114 on Windows

View result in a separate tab

Test name	Executions per second
obj instanceof Node	5662974.0 Ops/sec
obj has nodeName prop	12845258.0 Ops/sec
obj has nodeType prop	15712986.0 Ops/sec
obj has nodeType is greater then 0	15726760.0 Ops/sec
obj nodeType is not undefined	15227168.0 Ops/sec
nodeType prop is in obj	18609512.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what is tested, compared options, pros and cons of those approaches, and other considerations.

**Benchmark Definition**

The benchmark defines the test to check if a specified object is a DOM Node. The script preparation code creates an HTML element (`var obj = document.createElement('div');`) as the object being tested.

**Options Compared**

The benchmark compares six different options to check if the `obj` is a DOM Node:

1. `obj instanceof Node`: This checks if the object is an instance of the `Node` class, which is the base class for all DOM nodes.
2. `!!obj.nodeName`: This checks if the object has a `nodeName` property and its value is not empty or null.
3. `!!obj.nodeType`: This checks if the object has a `nodeType` property and its value is not undefined.
4. `obj.nodeType > 0`: This checks if the `nodeType` property is greater than 0, which is a common value for DOM nodes.
5. `typeof obj.nodeType !== 'undefined'`: This checks if the `nodeType` property exists in the object using the `typeof` operator.
6. `'nodeType' in obj`: This checks if the `nodeType` property is present as a key in the object.

**Pros and Cons of Each Approach**

1. **obj instanceof Node**: Pros: Simple, straightforward way to check if an object is a DOM node. Cons: May not work for non-DOM objects that inherit from `Node`.
2. **!!obj.nodeName**: Pros: Easy to understand and implement. Cons: May return false positives (e.g., if the object has a `nodeName` property but it's empty or null).
3. **!!obj.nodeType**: Pros: Similar to `!!obj.nodeName`, but specifically checks for `nodeType`. Cons: Same as above.
4. **obj.nodeType > 0**: Pros: Easy to understand and implement, especially for developers familiar with DOM nodes. Cons: May not work if the object's node type is -1 or NaN.
5. **typeof obj.nodeType !== 'undefined'**: Pros: Checks if the property exists without trying to access its value. Cons: May return false positives (e.g., if the object has a non-DOM `nodeType` property).
6. `'nodeType' in obj`: Pros: Simple and straightforward way to check for property existence. Cons: May not work if the object's node type is an instance of a different class.

**Other Considerations**

* **Library usage**: The benchmark uses the `Node` class, which is part of the ECMAScript Standard Library. This ensures that the test works across different browsers and environments.
* **Special JS feature or syntax**: None mentioned in the provided JSON. However, some of the options might require knowledge of advanced JavaScript features, such as the use of the `!!` operator to coerce a value to a boolean.

**Alternative Approaches**

Other ways to check if an object is a DOM node could include:

* Using a library like Lodash or Underscore.js, which provide utility functions for working with objects and arrays.
* Implementing a custom function that checks for the presence of specific properties (e.g., `nodeType`, `nodeName`) on the object.
* Using a more modern approach, such as using the `instanceof` operator in conjunction with a class constructor function to check if an object is an instance of a specific class.

Overall, the provided benchmark offers a good starting point for testing DOM node checks, and the options compared provide a range of choices for developers to consider.

Related benchmarks:

Check if specified obj is DOM Node (version: 3)

Comparing performance of: obj instanceof Node vs obj has nodeName prop vs obj has nodeType prop vs obj has nodeType is greater then 0 vs obj nodeType is not undefined vs nodeType prop is in obj

Created: one year ago by: Registered User

Jump to the latest result

obj instanceof Node

obj has nodeName prop

obj has nodeType prop

obj has nodeType is greater then 0

obj nodeType is not undefined

nodeType prop is in obj

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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