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Instanceof vs property access
(version: 0)
Benchmark.js
Comparing performance of:
Instanceof vs property access
Created:
4 years ago
by:
Guest
Go to the latest result
Script Preparation code:
elem = document.createElement('div');
Tests:
Instanceof
elem instanceof HTMLElement
property access
elem.nodeType === Node.ELEMENT_NODE
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Instanceof
property access
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:120.0) Gecko/20100101 Firefox/120.0
Browser/OS:
Firefox 120 on Linux
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=489971" width="100%" height="500px"></iframe>
property access
1766.2M/s
Instanceof
14.1M/s
View exact numbers
Test name
Executions per second
✓
property access
1,766,175,104 Ops/sec
Instanceof
14,132,819 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**What is tested on the provided JSON?** The provided JSON represents a JavaScript microbenchmark test case, specifically comparing two approaches: `instanceof` and property access. The test aims to measure the performance difference between these two methods when checking if an object is of type `HTMLElement`. **Options compared:** 1. **`instanceof`**: This method checks if an object is an instance of a specific constructor. In this case, it's used to check if `elem` is an instance of `HTMLElement`. 2. **Property access**: This approach uses the `nodeType` property to check if `elem` is an element node. **Pros and cons of each approach:** * **`instanceof`**: * Pros: * More explicit and readable code * Can be more efficient for certain types of objects (e.g., when the object's constructor has a unique signature) * Cons: * May incur additional overhead due to the lookup in the `Prototype` chain * Might not work as expected if the object's prototype is changed or inherited from multiple prototypes * **Property access**: * Pros: * Typically faster and more lightweight than `instanceof` * Works well for checking basic node types (e.g., element, text, comment) * Cons: * Less readable code, as the property name is not immediately obvious * Might require additional checks to ensure the correct property exists **Library and purpose:** There is no specific library mentioned in the JSON. The test relies on built-in JavaScript functionality. **Special JS feature or syntax:** There are no special features or syntaxes mentioned in this benchmark. It's a straightforward test case that uses standard JavaScript constructs. **Alternative approaches:** Other alternatives to `instanceof` and property access could include: * Using the `isElement` function from a library like jQuery (although not explicitly used here, it suggests an alternative approach) * Employing a custom implementation using bitwise operations or other performance-critical methods * Leveraging compiler optimizations or Just-In-Time (JIT) compilation to reduce overhead For this specific benchmark, the choice between `instanceof` and property access depends on the desired balance between readability, maintainability, and performance.
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