Benchmark: internal function declaration

Script Preparation code:

function a1(n) {
    return n + 2;
}

function a2(n) {
    return n - 2
}

function a(n) {
    return a1(n) + a2(n)
}


function b(k) {
    return b1() + b2()
    
    function b1() {
    	return k + 2;
    }

    function b2() {
        return k - 2;
    }
}

Tests:

outside declaration
a(5)
inner closure
b(5)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
outside declaration
inner closure

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

I'd be happy to explain what's being tested in this JavaScript microbenchmark.

**Benchmark Definition**

The benchmark is testing the performance of two different approaches to declaring functions: **outside declaration** (e.g., `function a(n) { ... }`) and **inner closure** (e.g., `function b(k) { return k + 2; }`).

In an outside declaration, the function is defined at the top level of the script, and its scope includes all variables in the surrounding context. In contrast, an inner closure is defined inside another function and has a limited scope that only refers to variables within that function.

**Options Compared**

The benchmark compares two options:

1. **Outside Declaration**: This approach defines functions as standalone declarations, which can be called directly without referencing their outer scope.
2. **Inner Closure**: This approach defines functions inside another function, which creates an inner scope for the inner function and limits its access to variables within that function.

**Pros and Cons**

* Outside Declaration:
	+ Pros: Easy to read and understand, avoids potential naming conflicts with outer scopes.
	+ Cons: May lead to slower performance due to lookups in the outer scope.
* Inner Closure:
	+ Pros: Can provide faster performance since the inner function has a limited scope and can access variables directly.
	+ Cons: Can be harder to read and maintain, especially for complex closures.

**Library and Special JS Feature**

The benchmark uses the `b1()` and `b2()` functions defined in the script, which are examples of inner closures. These functions have limited scopes that only refer to variables within their own definitions (`k`).

There is no special JavaScript feature being tested; it's a straightforward comparison of two approach.

**Other Alternatives**

Other alternatives for declaring functions include:

* **Arrow Functions**: Introduced in ECMAScript 2015, arrow functions provide a concise way to define small functions with limited scope. They are similar to regular functions but do not have their own `this` context.
* **Immediately Invoked Function Expressions (IIFE)**: An IIFE is a function that's executed immediately after its definition, often used for creating closures.

However, these alternatives are not being tested in this benchmark.

**Benchmark Preparation Code**

The script preparation code defines two functions, `a1(n)` and `a2(n)`, which are then used to define the main function `a(n)`. The script also defines a similar inner closure-based function `b(k)`. The `Html Preparation Code` field is empty, indicating that this benchmark does not require any HTML-related setup.

**Individual Test Cases**

The benchmark defines two individual test cases:

* `outside declaration`: This test case uses the main function `a(n)` with an outside declaration.
* `inner closure`: This test case uses the inner closure-based function `b(k)`.

The benchmark results provide performance data for each test case across multiple browser executions, allowing users to compare the performance of these two approaches.

Related benchmarks:

internal function declaration (version: 0)

Comparing performance of: outside declaration vs inner closure

Created: 2 years ago by: Guest

Jump to the latest result

outside declaration

inner closure

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):