Benchmark: rest parameters vs arguments 4

Script Preparation code:

function h1(...args) {
    return args.map((x)=>x)
}

function h2(args) {
    return args.map((x)=>x)
}

Tests:

rest arguments
const els = h1("1","1","1","1","1","1","1","1","1");
array parameter
const els = h2(["1","1","1","1","1","1","1","1","1"]);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
rest arguments
array parameter

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one month ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36

Browser/OS: Chrome 146 on Windows

View result in a separate tab

Test name	Executions per second
rest arguments	16052623.0 Ops/sec
array parameter	15781270.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its options.

**Benchmark Definition**

The benchmark is defined in two parts: `Script Preparation Code` and `Html Preparation Code`. The script preparation code defines two functions, `h1` and `h2`, which take either rest parameters (`...args`) or arguments (`args`). Both functions map over their input and return the same result.

**Options Compared**

The benchmark compares two options:

1. **Rest Parameters (Spread Operator)**: This approach uses the spread operator (`...args`) to unpack the function arguments into individual arguments. The `h1` function takes an arbitrary number of arguments, which are then mapped over using the arrow function syntax.
2. **Arguments List**: This approach requires passing the function arguments as an array. The `h2` function takes a single argument, an array of strings, which is also mapped over.

**Pros and Cons**

* **Rest Parameters (Spread Operator)**:
	+ Pros:
		- More concise and expressive syntax.
		- Can handle variable numbers of arguments without the need for explicit loops or indexing.
	+ Cons:
		- May be less efficient due to the creation of a new array.
		- Can lead to unexpected behavior if not used carefully (e.g., passing in null values).
* **Arguments List**:
	+ Pros:
		- More predictable and controlled syntax.
		- Can provide better performance due to fewer array creations.
	+ Cons:
		- Requires passing the arguments as an array, which can be less readable and more verbose.

In general, rest parameters are a good choice when you need to handle variable numbers of arguments in a concise way. However, if predictability and control over the execution order are crucial, using an array may be a better option.

**Library Used**

There is no explicit library mentioned in the benchmark definition. The functions `h1` and `h2` seem to be part of the JavaScript core or a standard library function.

**Special JS Features/Syntax**

The test cases use the spread operator (`...args`) to pass rest parameters, which is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). This syntax allows functions to accept an arbitrary number of arguments without needing explicit indexing or loops. The arrow function syntax (`=>`) is also used to define concise functions.

If you're not familiar with the spread operator or arrow functions, don't worry! They are widely supported in modern browsers and JavaScript engines.

**Alternatives**

Other alternatives for testing performance benchmarks might include:

1. Using different JavaScript versions: Test the benchmark on different versions of JavaScript (e.g., ES5 vs. ES6) to see how compatibility and performance change.
2. Testing with different input sizes: Vary the size of the input arrays or strings to see how performance changes under different workloads.
3. Implementing different optimizations: Use techniques like caching, memoization, or parallel execution to optimize the benchmark and measure their impact on performance.

Keep in mind that the specific test case and benchmark definition determine which alternatives are most relevant and useful.

Related benchmarks:

rest parameters vs arguments 4 (version: 0)

Comparing performance of: rest arguments vs array parameter

Created: 3 years ago by: Guest

Jump to the latest result

rest arguments

array parameter

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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