Benchmark: eval vs new Function1

Script Preparation code:

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

Tests:

eval
(0,eval)("2 * 3");
new Function
func();

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: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36 Edg/91.0.864.67

Browser/OS: Chrome 91 on Windows

View result in a separate tab

Test name	Executions per second
eval	2236991.0 Ops/sec
new Function	10909782.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what's being tested.

**Benchmark Definition**
The benchmark definition is a JSON object that represents the test case. In this case, we have two benchmark definitions:

1. `"Name": "eval vs new Function1"`, which describes the overall benchmark.
2. The first benchmark definition: `"(0,eval)(\"2 * 3\");"`. This defines a microbenchmark that tests the performance of the `eval` function with a specific input.
3. The second benchmark definition: `"func();"`. This defines another microbenchmark that tests the performance of creating a new instance of the `Function` constructor.

**Script Preparation Code**
The script preparation code is where the test sets up the environment for the microbenchmark. In this case, we have:

1. `var func = new Function("return 2 * 3");`, which creates a new function that returns the product of 2 and 3.
2. The second microbenchmark uses an existing function named `func` (defined in the script preparation code).

**Library**
In the second benchmark definition, we see: `"func();"`. This indicates that the `Function` constructor is being used to create a new instance. However, it's worth noting that the actual implementation of `func` is not shown in this JSON.

The `Function` constructor is a built-in JavaScript library that allows you to dynamically create functions at runtime. It takes several arguments, including a string containing the function body and optional parameters.

**Options Compared**
In this benchmark, we have two options being compared:

1. Using the `eval` function with a specific input.
2. Creating a new instance of the `Function` constructor with a specific input.

The pros and cons of these approaches are:

* `eval`:
	+ Pros: Can execute dynamic code at runtime.
	+ Cons: Can be slow due to the overhead of parsing and compiling the code, and may expose security vulnerabilities if not used carefully.
* Creating a new instance of `Function`:
	+ Pros: Can provide more control over the creation process and can be faster than using `eval`.
	+ Cons: Requires manual parameter handling and can be more verbose.

**Other Considerations**
When choosing between these two approaches, consider the following:

* Performance: If you need to execute dynamic code frequently, creating a new instance of `Function` might be faster. However, if you're just looking for a quick way to execute simple expressions, `eval` might be sufficient.
* Security: Be cautious when using `eval`, as it can expose your application to security vulnerabilities. Creating a new instance of `Function` can help mitigate this risk.

**Alternatives**
If you don't have access to the `Function` constructor or prefer not to use it, you could consider alternative approaches:

1. Using a library like `lodash` or `underscore`, which provide utility functions for dynamic code execution.
2. Implementing your own dynamic code execution mechanism using a scripting engine like V8 (used by Chrome) or SpiderMonkey (used by Firefox).
3. Using a different language or framework that provides built-in support for dynamic code execution, such as Python with its `exec` function.

In summary, this benchmark tests the performance of two approaches: using the `eval` function and creating a new instance of the `Function` constructor. The choice between these options depends on your specific use case, performance requirements, and security concerns.

Related benchmarks:

eval vs new Function1 (version: 0)

Comparing performance of: eval vs new Function

Created: 3 years 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 one month ago):