Benchmark: eval vs new Function v5

Script Preparation code:

var funcInt = Function("x", "return x % 33 == 0"); var funcNat = function(x) { return x % 33 == 0; };

Tests:

new Function
var sum = 0; for (var i = 0; i < 1000; ++i) { sum += funcInt(i); }
func
var sum = 0; for (var i = 0; i < 1000; ++i) { sum += funcNat(i); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
new Function
func

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.120 Safari/537.36

Browser/OS: Chrome 77 on Linux

View result in a separate tab

Test name	Executions per second
new Function	10429.4 Ops/sec
func	10403.7 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down what's being tested in this JavaScript benchmark.

**Benchmark Definition**

The benchmark defines two different ways to create and use a function: `new Function` and a custom-defined function named `func`. The script preparation code provides two functions, `funcInt` and `funcNat`, which are used as examples in the test cases. `funcInt` is a built-in JavaScript function that returns the remainder of `x` divided by 33 when called with an integer argument. `funcNat` is a custom-defined function that achieves the same result.

**Options Compared**

The benchmark compares two approaches:

1. **new Function**: Creates a new function object using the `Function` constructor, which takes a string of code as its first argument and a variable name as its second argument.
2. **Custom-defined function (func)**: Defines a new function named `func` with a single parameter `x`, and then uses this function in the test cases.

**Pros and Cons**

* **new Function**: Pros:
	+ Can be used to dynamically create functions at runtime.
	+ Can capture variables from the surrounding scope.
	Cons:
	+ Creates a new function object, which can lead to higher memory usage.
	+ May incur additional overhead due to the constructor call.
* **Custom-defined function (func)**: Pros:
	+ Avoids the overhead of creating a new function object.
	+ Can be more efficient in terms of memory usage.
Cons:
	+ Requires defining the function explicitly, which can add complexity.
	+ May not capture variables from the surrounding scope.

**Other Considerations**

* The benchmark uses a simple arithmetic operation (modulus) to test the performance of each approach. In reality, more complex functions and operations may have different performance characteristics.
* The benchmark does not consider other factors that might affect performance, such as function length, number of parameters, or caching behavior.

**Library/Function Details**

None mentioned in this specific benchmark. However, it's worth noting that the `Function` constructor is a built-in JavaScript feature, and its usage can be complex due to security concerns (e.g., eval).

No special JS features or syntax are used in this benchmark.

Related benchmarks:

eval vs new Function v5 (version: 0)

Comparing performance of: new Function vs func

Created: 5 years ago by: Guest

Jump to the latest result

new Function

func

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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