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nodeType vs instanceof 2
(version: 0)
Comparing performance of:
nodeType vs instanceof vs nodeType literal
Created:
6 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var xs = []; var n = 0; for (let i = 0; i < 1000; ++i) { xs[i] = (Math.random() > .5) ? document.createElement(`a`) : document.createTextNode(``); };
Tests:
nodeType
n += (xs[(Math.random() * 1000)|0].nodeType === Node.ELEMENT_NODE)|0;
instanceof
n += ((xs[(Math.random() * 1000)|0]) instanceof HTMLElement)|0;
nodeType literal
n += (xs[(Math.random() * 1000)|0].hasOwnProperty('nodeType'))|0;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
nodeType
instanceof
nodeType literal
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.5 Safari/605.1.15
Browser/OS:
Safari 18 on Mac OS X 10.15.7
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=612928" width="100%" height="500px"></iframe>
nodeType literal
83.3M/s
instanceof
34.4M/s
nodeType
32.0M/s
View exact numbers
Test name
Executions per second
✓
nodeType literal
83,301,696 Ops/sec
instanceof
34,410,944 Ops/sec
nodeType
32,008,834 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested, compared, and the pros/cons of each approach. **Benchmark Overview** The benchmark measures the performance difference between three ways to check if an element is an instance of the `HTMLElement` type in JavaScript. The test case uses a large array (`xs`) containing a mix of HTML elements (e.g., anchor tags) and text nodes, which are randomly assigned to be either real or non-existent HTML elements. **Options Compared** 1. **nodeType literal**: This approach checks if the element has a `nodeType` property that equals 1, which is the value for an HTML element. 2. **nodeType**: This approach directly accesses the `nodeType` property of the element without checking if it exists. 3. **instanceof HTMLElement**: This approach uses the `instanceof` operator to check if the element is an instance of the `HTMLElement` class. **Pros and Cons** 1. **nodeType literal**: * Pros: Simple and efficient, as it avoids potential null pointer exceptions or type errors. * Cons: May not work correctly for non-standard elements (e.g., canvas) that have a different `nodeType`. 2. **nodeType**: * Pros: Fast and straightforward, but may lead to performance issues if the element's `nodeType` property is accessed frequently. * Cons: Potential null pointer exceptions or type errors if the element doesn't have this property. 3. **instanceof HTMLElement**: * Pros: Robust and reliable, as it checks for a specific class hierarchy. * Cons: May be slower than direct property access due to the type checking overhead. **Library/Feature** None of the options use a library or feature that's not part of the standard JavaScript language. However, the `HTMLElement` class is a built-in class in modern browsers, and its usage may require additional features like `prototype` chain lookup (not explicitly mentioned in the benchmark). **Special JS Feature/Syntax** There are no special JS features or syntax used in this benchmark that would make it unique or non-standard. The test case uses standard JavaScript variables, loops, and conditional statements. **Other Alternatives** If you're looking for alternative approaches to check if an element is an instance of a specific class in JavaScript, you could consider: 1. **class-based approach**: Use the `instanceof` operator with a custom class constructor that checks for the desired properties or behavior. 2. **function-based approach**: Create a function that takes an object as an argument and returns true if it matches the desired criteria. 3. **enum-based approach**: Use enums to define a set of values that can be checked against, which can provide a more explicit and type-safe way of checking instances. These alternatives might be useful in specific scenarios where the `instanceof` operator or direct property access isn't sufficient or efficient enough.
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