Benchmark: arguments vs array arg

Script Preparation code:

function test() {
    var v = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        v[_i] = arguments[_i];
    }
  var different = false;
  for (var j = 0; j < v.length; j++) {
    if (j % 2 === 0) different = true;
  }
  return different;
}


function test2(v) {
  var different = false;
  for (var j = 0; j < v.length; j++) {
    if (j % 2 === 0) different = true;
  }
  return different;
}

Tests:

arguments
for(var i = 0; i < 10000; i++) { test(i, i + 1, i + 2, i + 3, i + 4, i + 5); }
array arg
for(var i = 0; i < 10000; i++) { test2([i, i + 1, i + 2, i + 3, i + 4, i + 5]); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
arguments
array arg

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

**What is being tested?**

The provided JSON represents two JavaScript microbenchmarks, `arguments vs array arg`, which compare the performance of two approaches to pass arguments to a function:

1.  **`arguments`**: This approach uses the built-in `arguments` object in JavaScript, which contains an array-like object containing the values passed to a function.
2.  **`array arg`**: This approach passes an array literal as the first argument to the function.

**Options compared**

The benchmark tests the performance of two approaches: using `arguments` and passing an array literal.

**Pros and Cons of each approach**

*   **Using `arguments`**:
    *   Pros:
        *   Simple and straightforward.
        *   Native JavaScript syntax, so no additional libraries are required.
    *   Cons:
        *   May have slower performance due to the overhead of creating an array-like object.
*   **Passing an array literal** (`array arg`):
    *   Pros:
        *   Can be faster since arrays can be optimized by the JavaScript engine.
    *   Cons:
        *   Requires additional library support (in this case, none is mentioned) or a specific function signature.

**Library usage**

There is no explicit mention of any libraries being used in these benchmark tests. The `arguments` approach relies on native JavaScript syntax, and the `array arg` approach uses an array literal, which does not require any additional library support.

**Special JS features or syntax**

There are no special JS features or syntax mentioned that would require specific handling or configuration for this benchmark.

**Other alternatives**

If you're looking to optimize performance by avoiding the overhead of creating an array-like object using `arguments`, consider passing an array literal as an argument, like in the `array arg` approach. However, keep in mind that this might still depend on the browser and JavaScript engine's optimization capabilities.

Latest run results:

Run details: (Test run date: 2025 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:58.0) Gecko/20100101 Firefox/58.0

Browser/OS: Firefox 58 on Mac OS X 10.12

View result in a separate tab

Test name	Executions per second
arguments	2481.7 Ops/sec
array arg	10435.5 Ops/sec

Related benchmarks:

arguments vs array arg (version: 0)

Comparing performance of: arguments vs array arg

Created: 6 years ago by: Guest

Jump to the latest result

arguments

array arg

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):