Benchmark: in vs direct call

Script Preparation code:

var props = {foo: 'foo', bar: 'bar', baz: 'baz' }

Tests:

in
'pointerOnMoveCallback' in props;
direct
props.pointerOnMoveCallback

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
in
direct

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gemma2:9b, generated 27 days ago):

LLMs can make mistakes. Check important info.

This benchmark tests the performance difference between accessing a property using the `in` operator versus direct property access in JavaScript.

**Options Compared:**

* **`in` Operator (`'pointerOnMoveCallback' in props;`)**: This checks if a specific property name exists within an object. It returns `true` if the property is found, `false` otherwise.
* **Direct Property Access (`props.pointerOnMoveCallback`)**: This directly retrieves the value associated with the specified property name from the object.

**Pros and Cons:**

* **`in` Operator:**
    * **Pro:** Can be useful for checking if a property exists before attempting to access it, preventing potential errors.
    * **Con:**  Generally slower than direct property access as it involves additional checks within JavaScript's internal mechanisms.
* **Direct Property Access:**
    * **Pro:** More efficient and faster as it directly targets the desired property without extra lookups.
    * **Con:** Can throw an error if the property doesn't exist, requiring error handling.

**Other Considerations:**

In most cases, direct property access is preferred for its performance benefits unless you specifically need to check for the existence of a property before accessing it. The `in` operator might be more appropriate when iterating through object properties and only needing to process those that exist.

Let me know if you have any other benchmarks you'd like analyzed!

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.163 Safari/537.36

Browser/OS: Chrome 80 on Windows

View result in a separate tab

Test name	Executions per second
in	6829235.0 Ops/sec
direct	6445869.5 Ops/sec

Related benchmarks:

in vs direct call (version: 0)

Comparing performance of: in vs direct

Created: 4 years ago by: Registered User

Jump to the latest result

in

direct

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gemma2:9b, generated 27 days ago):