Benchmark: Javascript eval vs regular function

Script Preparation code:

var func = () => {
  return (2*3/5+10*80/2+10*4)
}

Tests:

regular
func();
eval
eval("2*3/5+10*80/2+10*4");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regular
eval

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.

I'll break down the explanation into sections to make it easier to understand.

**Benchmark Definition**

The benchmark is designed to compare the performance of JavaScript's `eval()` function versus regular functions (also known as anonymous functions). The script itself performs a mathematical expression calculation: `(2*3/5+10*80/2+10*4)`. This expression is used in both test cases.

**Script Preparation Code**

The script preparation code defines an anonymous function, `func()`, which returns the same mathematical expression. This function will be executed repeatedly to measure its performance.

**Html Preparation Code**

There is no HTML preparation code provided for this benchmark. The benchmark only involves JavaScript code.

**Individual Test Cases**

There are two test cases:

1. **"regular"`**: This test case executes the `func()` function directly.
2. **"eval"`**: This test case uses `eval()` to execute the same mathematical expression as in the `func()` function.

**Pros and Cons of Each Approach**

1. **Regular Function (func())**:
	* Pros:
		+ Faster execution, since it doesn't involve the overhead of parsing and executing a string.
		+ Better optimization by the JavaScript engine, since it's a native function call.
	* Cons: None significant in this case, as it's just an anonymous function.
2. **`eval()` Function**:
	* Pros:
		+ Can execute any valid JavaScript expression, not limited to a specific function signature.
	* Cons:
		+ Slower execution due to the overhead of parsing and executing a string.
		+ Less optimization by the JavaScript engine, since it's a dynamic evaluation.

**Library and Purpose**

In this benchmark, `eval()` is used as a built-in JavaScript function. The purpose of `eval()` is to execute a string as JavaScript code, allowing for more flexible evaluation of mathematical expressions or other code snippets.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntaxes mentioned in the provided benchmark.

**Other Alternatives**

If you wanted to compare the performance of different approaches, you could consider adding additional test cases, such as:

1. Using a regular function with a more complex calculation.
2. Using `eval()` with a more complex expression.
3. Compiling the expression to machine code using a library like V8's compiler.
4. Using a JavaScript engine like SpiderMonkey or SquirrelFish for comparison.

Keep in mind that these alternatives would require additional setup and modifications to the benchmark, but could provide valuable insights into performance differences between various approaches.

Related benchmarks:

Javascript eval vs regular function (version: 0)

Comparing performance of: regular vs eval

Created: 4 years ago by: Guest

Jump to the latest result

regular

eval

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):