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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:
2 years ago
by:
Registered User
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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>
Run tests (6)
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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:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
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.
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