Benchmark: Rest vs. Arguments to Array

Script Preparation code:

function rest(...args) {
  return function(fn) {
    return args.map(fn);
  };
}

function argsToArray() {
  const len = arguments.length;
  const args = Array(len);
  for (let i = 0; i < len; i++) {
    args[i] = arguments[i];
  }
  return function(fn) {
    return args.map(fn);
  };
}

Tests:

rest with 10 args
rest(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)(n => 2 * n);
rest with 1 arg
rest(1)(n => 2 * n);
argsToArray with 10 args
argsToArray(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)(n => 2 * n);
argsToArray with 1 arg
argsToArray(1)(n => 2 * n);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
rest with 10 args
rest with 1 arg
argsToArray with 10 args
argsToArray with 1 arg

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 140 on Android

View result in a separate tab

Test name	Executions per second
rest with 10 args	1706483.8 Ops/sec
rest with 1 arg	3989007.5 Ops/sec
argsToArray with 10 args	992269.1 Ops/sec
argsToArray with 1 arg	3006183.0 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 explain what is being tested, the options being compared, their pros and cons, and other considerations.

**Benchmark Definition:**
The benchmark measures the performance difference between two approaches for handling function arguments in JavaScript:

1. **Rest syntax (`...args`)**: This approach uses an array of arguments and maps each argument to a value using the provided function.
2. **Converting arguments to an array**: This approach converts the arguments passed to a function into an array, which is then mapped to values.

**Script Preparation Code:**
The script preparation code defines two functions:

* `rest`: Returns a function that takes another function `fn` as an argument. The returned function maps each argument in the rest parameter `args` to a value using `fn`.
* `argsToArray`: Converts the arguments passed to a function into an array, which is then mapped to values.

**Individual Test Cases:**
The benchmark defines four test cases:

1. `rest(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)(n => 2 * n)`: Tests the rest syntax with 10 arguments.
2. `rest(1)(n => 2 * n)`: Tests the rest syntax with only 1 argument.
3. `argsToArray(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)(n => 2 * n)`: Tests converting arguments to an array with 10 arguments.
4. `argsToArray(1)(n => 2 * n)`: Tests converting arguments to an array with only 1 argument.

**Library and Special Features:**
None of the provided test cases use any libraries or special JavaScript features beyond standard ECMAScript syntax.

**Options Compared:**

* **Rest syntax (`...args`) vs. Converting arguments to an array**: The benchmark compares the performance difference between these two approaches for handling function arguments.
	+ Pros of rest syntax:
		- More concise and readable code
		- Allows for easy addition or removal of arguments without modifying the function signature
	+ Cons of rest syntax:
		- May incur overhead due to array creation and manipulation
		- Limited support in older browsers (prior to ECMAScript 2015)
	+ Pros of converting arguments to an array:
		- Can provide more control over argument handling
		- May be more efficient for certain use cases
	+ Cons of converting arguments to an array:
		- More verbose code compared to rest syntax
		- May require additional memory allocation and copying

**Other Considerations:**

* The benchmark focuses on the performance difference between these two approaches, but it's essential to consider other factors like readability, maintainability, and browser support when choosing a method.
* The use of modern JavaScript features (e.g., rest syntax) may result in varying performance across different browsers and versions.

**Alternatives:**

* Other methods for handling function arguments include:
	+ Using an array or object as the first argument
	+ Utilizing a library like Ramda or Lodash for functional programming approaches
	+ Implementing custom argument handling using closures or higher-order functions

Keep in mind that this is not an exhaustive list, and other factors may influence your choice of method depending on your specific use case.

Related benchmarks:

Rest vs. Arguments to Array (version: 0)

Using the rest syntax (...args) versus converting arguments to an array.

Comparing performance of: rest with 10 args vs rest with 1 arg vs argsToArray with 10 args vs argsToArray with 1 arg

Created: 8 years ago by: Guest

Jump to the latest result

rest with 10 args

rest with 1 arg

argsToArray with 10 args

argsToArray with 1 arg

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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