Benchmark: eval vs new Functionhhh

Script Preparation code:

var func = new Function("return 2 * 3");

Tests:

eval
eval("2 * 3");
new Function
new Function("return 2 * 3")();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
eval
new Function

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases to understand what is being tested.

**Benchmark Definition:**

The benchmark definition uses two different approaches to perform a simple arithmetic operation: `eval("2 * 3")` and `new Function("return 2 * 3")()`.

Here, "eval" function is used to execute the string as JavaScript code. This approach allows for more flexibility in evaluating expressions, but can also introduce security risks if not properly sanitized.

On the other hand, `new Function("return 2 * 3")()` creates a new anonymous function that evaluates the expression and returns its result. This approach provides a safer way to execute code, as it doesn't allow arbitrary code execution like `eval`.

**Pros and Cons:**

- **Eval Approach:**
  - Pros:
    - Can be faster in some cases due to optimized JavaScript engine.
    - Easier to implement, especially for simple expressions.
  - Cons:
    - Security risks if not properly sanitized, as it allows executing arbitrary code.
    - May have performance issues with complex or malformed input.

- **New Function Approach:**
  - Pros:
    - Safer and more secure way to execute code, reducing security risks.
    - Better suited for complex expressions or user-input data.
  - Cons:
    - May be slower in some cases due to the creation of a new function object.
    - More complex implementation, especially when dealing with complex expressions.

**Library/Function:**

In this benchmark, the `eval` and `new Function` functions are used directly in the test case. These functions are built-in JavaScript functions that allow executing code as strings or creating anonymous functions.

**Special JS Feature/Syntax:**

There is no specific JavaScript feature or syntax being tested here. The focus is on comparing the performance of two different approaches to evaluating a simple arithmetic expression.

**Other Alternatives:**

If you were looking for alternative approaches, some options could include:

- Using a library like `js-calc` which provides more efficient arithmetic operations.
- Implementing a custom parser or interpreter for the arithmetic expressions.
- Using a Just-In-Time (JIT) compiler to optimize the execution of the code.

In terms of alternatives to `eval`, you could consider using:

- The `Function constructor` with the `String` argument, as shown in the benchmark definition (`new Function("return 2 * 3")()`).
- The `Arrow function syntax` (e.g., `(x) => x * 2`) which can be more efficient than traditional functions.
- The `let`/`const` declaration with a shorthand arrow function (e.g., `const add = (a, b) => a + b;`).

Keep in mind that these alternatives might not provide the exact same functionality or performance as the original approaches.

Latest run results:

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

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36 Edg/111.0.1661.54

Browser/OS: Chrome 111 on Linux

View result in a separate tab

Test name	Executions per second
eval	28418.5 Ops/sec
new Function	22113.9 Ops/sec

Related benchmarks:

eval vs new Functionhhh (version: 0)

Comparing performance of: eval vs new Function

Created: one year ago by: Guest

Jump to the latest result

eval

new Function

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):