Benchmark: Unused variables

Tests:

Without unused variables
function getName(name) { return name; } getName('Emmanuel');
With unused variables
function getName(name, lastName) { return name; } getName('Emmanuel');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Without unused variables
With unused variables

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36

Browser/OS: Chrome 95 on Linux

View result in a separate tab

Test name	Executions per second
Without unused variables	507182784.0 Ops/sec
With unused variables	615338560.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to explain the benchmark and provide an analysis of the test cases.

**Benchmark Overview**

MeasureThat.net is a platform that allows users to create and run JavaScript microbenchmarks. A microbenchmark is a small program designed to measure the performance of specific aspects of JavaScript, such as execution speed or memory usage.

The provided benchmark measures the performance difference between two functions: `getName` with and without unused variables.

**Test Cases**

There are two individual test cases:

1. **Without unused variables**: The function `getName` takes a single parameter `name` and returns its value.
```javascript
function getName(name) {
  return name;
}
```
2. **With unused variables**: The function `getName` takes two parameters, `name` and `lastName`, but only uses the `name` parameter in the returned statement.
```javascript
function getName(name, lastName) {
  return name;
}
```

**Comparison**

The test cases are designed to measure the performance difference between these two implementations. In the first case (without unused variables), both parameters (`name` and `lastName`) are used to compute the result. In the second case (with unused variables), only the `name` parameter is used, while the `lastName` parameter is simply ignored.

**Performance Comparison**

According to the latest benchmark results, there is a significant performance difference between the two test cases:

* "With unused variables" executes at approximately 615 million executions per second.
* "Without unused variables" executes at approximately 507 million executions per second.

This suggests that having unused variables in a function can lead to slightly slower execution times due to the overhead of checking and processing parameters, even if they are not used.

**Pros and Cons**

Pros of using unused variables:

* Code readability: Unused variables can make the code more readable by explicitly stating what each parameter represents.
* Maintainability: Unused variables can help maintain the structure of a function, making it easier to understand how parameters interact with each other.

Cons of using unused variables:

* Performance overhead: As seen in this benchmark, using unused variables can lead to slower execution times due to unnecessary computation and memory allocation.

**Library Usage**

There is no explicit library usage mentioned in the provided code snippets. However, MeasureThat.net often includes benchmarks that involve libraries like V8 or SpiderMonkey, which are used as part of the JavaScript engine.

**Special JS Features or Syntax**

This benchmark does not involve any special features or syntax beyond the standard JavaScript language.

**Alternatives**

If you're interested in running similar microbenchmarks or exploring other performance-related tests on MeasureThat.net, here are some suggestions:

1. Explore other benchmark categories: MeasureThat.net offers a wide range of benchmarks for various aspects of JavaScript, such as string manipulation, array operations, or DOM access.
2. Analyze browser-specific benchmarks: Many test cases are designed to specifically measure performance differences between different browsers, like Chrome, Firefox, or Safari.
3. Run custom benchmarks: If you have a specific requirement or use case in mind, you can create your own benchmark on MeasureThat.net and share it with the community.

Keep in mind that while this benchmark provides valuable insights into the performance impact of unused variables, there may be other factors at play that influence actual execution times in real-world scenarios.

Related benchmarks:

Unused variables (version: 0)

Comparing performance of: Without unused variables vs With unused variables

Created: 3 years ago by: Guest

Jump to the latest result

Without unused variables

With unused variables

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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