Benchmark: eval vs new Function call

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

Latest run results:

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

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 131 on Android

View result in a separate tab

Test name	Executions per second
eval	1623822.1 Ops/sec
new Function	793926.2 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its test cases.

**What is tested?**

The benchmark tests two different approaches to perform arithmetic operations: `eval` and creating a new function using `Function`. The purpose of these tests is to compare their performance, specifically in terms of how many executions per second they can handle.

**Options compared**

*   **eval**: This function takes a string as an argument and evaluates it as JavaScript code. In this case, the input strings are "2 * 3" and return 6.
*   **new Function**: This creates a new function that executes the provided code when called with no arguments. The input strings are also "2 * 3", but they're passed to the newly created function.

**Pros and cons of each approach**

*   **eval**
    *   Pros:
        *   Simple to use; you just pass your JavaScript expression as a string.
        *   Can be used for complex expressions, not limited to simple arithmetic operations.
    *   Cons:
        *   Can pose security risks if the input is not validated properly (e.g., allowing malicious code execution).
        *   Generally slower than creating a new function due to overhead from parsing and compiling the string.

*   **new Function**
    *   Pros:
        *   More secure than `eval` since it doesn't execute arbitrary code directly.
        *   Faster for simple arithmetic operations, as there's less overhead compared to parsing and compiling a string.
    *   Cons:
        *   Requires creating a new function object, which can be slower due to the overhead of creating a new scope and binding the function's execution context.
        *   Can be more verbose than using `eval`.

**Libraries used**

None are explicitly mentioned in this benchmark.

**Special JavaScript features or syntax**

No specific features or syntax are being tested here; it is a basic arithmetic operation comparison.

Related benchmarks:

eval vs new Function call (version: 0)

Comparing performance of: eval vs new Function

Created: 6 years ago by: Guest

Jump to the latest result

eval

new Function

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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