Benchmark: inner-vs-outer-fn-declaration

Tests:

inner
const foo = () => { const a = (arg1) => arg1 * Math.random(); const b = (arg2) => arg2.map((el) => el * 2); return b(Array.from({ length: 100 }, (_, i) => a(i))) } Array.from({ length: 200 }, () => foo());
outer
const a = (arg1) => arg1 * Math.random(); const b = (arg2) => arg2.map((el) => el * 2); const foo = () => { return b(Array.from({ length: 100 }, (_, i) => a(i))) } Array.from({ length: 200 }, () => foo());

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
inner
outer

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's dive into the world of JavaScript microbenchmarks.

**Benchmark Definition and Structure**

The benchmark definition is a JSON object that describes the test case. In this case, there are two benchmark definitions: "inner" and "outer". Both definitions describe a similar scenario, but with a key difference in where the function declaration is located.

**What is being tested?**

The primary objective of this benchmark is to compare the performance of two different approaches:

1. **Inner function declaration**: In this approach, the inner function `a` is declared inside the outer function `foo`. This means that `a` has access to the variables and scope of the outer function.
2. **Outer function declaration**: In this approach, the outer function `foo` declares an inner function `b`, which is then used within itself.

**Options compared**

The benchmark compares the performance of these two approaches:

* Inner function declaration (`"inner"`): The inner function `a` is declared inside the outer function `foo`.
* Outer function declaration (`"outer"`): The outer function `foo` declares an inner function `b`, which is then used within itself.

**Pros and Cons**

Here are some pros and cons of each approach:

* **Inner function declaration (inner)**:
	+ Pros: Can simplify code and reduce the number of function declarations.
	+ Cons: May lead to performance issues due to scope pollution, as the inner function has access to variables in the outer function's scope.
* **Outer function declaration (outer)**:
	+ Pros: Can improve performance by reducing scope pollution and avoiding unnecessary variable lookups.
	+ Cons: Requires an additional function declaration for the inner function `b`, which may increase code complexity.

**Library usage**

In the benchmark definition, no libraries are explicitly mentioned. However, it's likely that the benchmark uses a built-in JavaScript library to execute the functions and measure performance.

**Special JS feature or syntax**

There is no special JS feature or syntax used in this benchmark. It only relies on standard JavaScript language features, such as function declarations, scope rules, and the `map` method.

**Alternative approaches**

Other alternative approaches to compare in a similar benchmark might include:

* Using closures instead of inner/outer functions
* Comparing performance with different types of loops (e.g., `for`, `while`, `forEach`)
* Adding additional complexity to the benchmark, such as using asynchronous execution or parallel processing

In terms of actual JavaScript implementations, some alternatives could be explored, like this:

- Creating a loop that iterates over an array and calls the functions
- Using the "fast-function" package for performance testing

Related benchmarks:

inner-vs-outer-fn-declaration (version: 0)

Comparing performance of: inner vs outer

Created: 6 years ago by: Guest

Jump to the latest result

inner

outer

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):