Benchmark: instanceof vs name check

Tests:

instanceof
new Error() instanceof Error
name check
new Error().name === "Error"

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
instanceof
name check

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

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**What is being tested?**

The provided benchmark tests two different approaches to check if an object is either an instance of a specific class or has a certain property named "name". The test cases are:

1. `new Error() instanceof Error`: This checks if the result of creating a new `Error` object and then calling the `instanceof` operator on it returns true.
2. `new Error().name === "Error"`: This checks if the property `name` of a new `Error` object is set to the string `"Error"`.

**Options compared**

Two options are being compared:

1. **` instanceof `**: This operator checks if an object is either an instance of (or inherits from) a given class.
2. **Property access (`new Error().name === "Error"`)**: This checks if a specific property exists and has a certain value.

**Pros and cons**

Here are some pros and cons of each approach:

* ` instanceof `:
	+ Pros:
		- More explicit and clear
		- Faster in terms of execution time (since it's a built-in operator)
	+ Cons:
		- May not be as performant due to its implementation details (e.g., checking the prototype chain)
* Property access (`new Error().name === "Error"`):
	+ Pros:
		- More readable and self-explanatory
		- Can be faster in certain cases, since it's a simple property lookup
	+ Cons:
		- May not work as expected if the `name` property is not set or has a different value

**Library usage**

None of the test cases use any external libraries.

**Special JS feature or syntax**

There are no special JavaScript features or syntax used in these test cases. The focus is on basic object creation, instanceof operator, and property access.

**Other alternatives**

If you wanted to create similar benchmarks for different approaches, here are some alternatives:

* Instead of ` instanceof `, use a library like Lodash's `isFunction` or a custom implementation.
* Use a library like Fastify or Express.js to test server-side middleware performance.
* Compare the execution times of using a specific JavaScript engine (e.g., V8 vs SpiderMonkey) for benchmarking.

Keep in mind that the specifics will depend on your use case and requirements.

Related benchmarks:

instanceof vs name check (version: 0)

Comparing performance of: instanceof vs name check

Created: 5 years ago by: Guest

Jump to the latest result

instanceof

name check

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):