Benchmark: eval vs new Function3

Script Preparation code:

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

Tests:

eval
eval("2 * 3");
new Function
func.apply();
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
new Function()

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided JSON represents a benchmarking test created on MeasureThat.net, comparing three approaches to evaluate a simple mathematical expression: `2 * 3`. The test consists of two parts: script preparation code and HTML preparation code.

**Script Preparation Code**

The first part is the script preparation code:
```javascript
var func = new Function("return 2 * 3;");
```
This code defines a function named `func` using the `new Function()` constructor, which takes an anonymous function as its argument. The anonymous function returns the result of evaluating `2 * 3`, which is then stored in the `func` variable.

**Html Preparation Code**

The second part is the HTML preparation code, which is empty in this case (`null`). This suggests that no specific HTML-related testing is being performed.

**Individual Test Cases**

There are three test cases defined:

1. **eval**
```javascript
"eval(\"2 * 3\");"
```
This test case uses the built-in `eval()` function to evaluate the mathematical expression `2 * 3`. The result of this evaluation is not stored in a variable, as it is executed immediately.

2. **new Function**
```javascript
"func.apply();"
```
This test case applies the function stored in `func` using the `apply()` method, effectively executing the original mathematical expression.

3. **new Function()**
```javascript
"new Function(\"return 2 * 3\")();"
```
This test case creates a new instance of the `Function` constructor with an anonymous function that returns the result of evaluating `2 * 3`. The resulting function is then immediately invoked using the parentheses (`()`).

**Library and Special JS Features**

The only library used in this benchmark is the built-in `Function` constructor, which allows creating anonymous functions. There are no special JavaScript features or syntax explicitly mentioned.

**Pros and Cons of Each Approach**

1. **eval**
	* Pros: Simple to implement, widely supported.
	* Cons: Can pose security risks if not properly sanitized, may have performance issues due to parsing the expression as JSON.
2. **new Function**
	* Pros: Allows for more control over function creation and execution.
	* Cons: May be slower than `eval` due to the overhead of creating a new function object.
3. **new Function()**
	* Pros: Provides a more explicit way of defining functions, can be useful in certain scenarios.
	* Cons: Similar to `new Function`, may have performance issues.

**Other Considerations**

When testing these approaches, it's essential to consider factors like:

* Performance: How many executions per second can each approach handle?
* Security: Are the results of `eval()` safe to use in production environments?
* Control: Do you need fine-grained control over function creation and execution?

**Alternatives**

If you're looking for alternative approaches, consider using:

1. **Template literals**: A more modern way of evaluating expressions, which may offer better performance.
2. **Arrow functions**: A concise way to define small, single-purpose functions.
3. **Babel transpilation**: If you need to support older JavaScript versions, consider using Babel to transpile your code.

Keep in mind that these alternatives might not be directly comparable to the original `eval()` vs `new Function` approach, but they can provide alternative solutions depending on your specific use case.

Related benchmarks:

eval vs new Function3 (version: 0)

Comparing performance of: eval vs new Function vs new Function()

Created: 3 years ago by: Guest

Jump to the latest result

eval

new Function

new Function()

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):