Benchmark: new paren - MeasureThat.net

HTML Preparation code:

<!--your preparation HTML code goes here-->

Tests:

paren outside
(new Set).add(0)
paren inside
new Set().add(0)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
paren outside
paren inside

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (X11; CrOS x86_64 14541.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser/OS: Chrome 132 on Chrome OS 14541.0.0

View result in a separate tab

Test name	Executions per second
paren outside	15854892.0 Ops/sec
paren inside	15983022.0 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated one year ago):

LLMs can make mistakes. Check important info.

The benchmark represented in the provided JSON compares two different JavaScript expressions aiming to test their performance with the `Set` data structure. The primary focus is on the syntax differences in how the `add` method is invoked on the `Set` object.

### Test Cases

There are two test cases defined in the benchmark:

1. **"paren outside"**: This test case uses the expression:
   ```javascript
   (new Set).add(0)
   ```
   Here, the `Set` constructor is called, and the parentheses around it are outside of the constructor call.

2. **"paren inside"**: This test case uses the expression:
   ```javascript
   new Set().add(0)
   ```
   In this case, the `Set` constructor is called normally without additional parentheses, and then the `add` method is directly invoked on the newly-created `Set` object.

### Pros and Cons of Each Approach

**Parentheses Outside (`(new Set).add(0)`):**
- **Pros:**
  - It is somewhat concise since it puts the `Set` object creation in parentheses.
  
- **Cons:**
  - Using parentheses might imply a level of precedence, which generally isn't necessary in this context.
  - Some developers may find it less readable, as it deviates from the common practice of directly instantiating objects and immediately calling methods.

**Parentheses Inside (`new Set().add(0)`):**
- **Pros:**
  - This is the more conventional syntax to create a new object and access its methods, enhancing readability and maintaining code clarity.
  - It clearly separates the construction of the `Set` object and its method invocation, making it easier for others to understand the code.

- **Cons:**
  - Few (if any) downsides; this syntax generally aligns with typical JavaScript practices and conventions.

### Benchmark Results

The results from the benchmark reveal the following performance metrics:
- For the **"paren inside"** approach, the execution rate was **15,983,022 executions per second**.
- For the **"paren outside"** approach, the execution rate was slightly lower at **15,854,892 executions per second**.

### Other Considerations

- The difference in execution speed between the two expressions is minor, but it highlights how even small variations in syntax can have implications on performance in JavaScript execution engines.
- Although the performance metrics indicate a small difference, it is essential to consider that such differences may become more significant in larger-scale applications or when performing similar operations in loops or intensive calculations.

### Alternatives and Additional Considerations

Other alternatives to `Set` for storing unique values in JavaScript include arrays combined with the use of `Array.prototype.includes()` for uniqueness checks, though it is generally less performant. In performance-critical applications, leveraging types like `WeakSet` could also be beneficial as it allows for the addition of objects that are only kept weakly, enabling garbage collection if there are no other references to them.

In summary, this benchmark investigates two syntactical approaches to utilizing the `Set` constructor in JavaScript, reinforcing best practices in terms of code clarity and readability while also revealing negligible performance differences between the two methods.

Related benchmarks:

new paren (version: 1)

Comparing performance of: paren outside vs paren inside

Created: one year ago by: Guest

Jump to the latest result

paren outside

paren inside

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated one year ago):