Benchmark: reduce spread vs flat()

Tests:

Spread operator
var params = [[ 1, 2 ], [ "hello", true, 7 ]]; var other = params.reduce((acc, val) => [...acc, ...val], []);
Flat
var params = [[1, 2, params], [ "hello", true, 7 ]]; var other = params.flat();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread operator
Flat

Fastest: N/A

Slowest: N/A

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

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**Benchmark Definition**

The benchmark definition provided is quite simple, with only two test cases:

1. `reduce spread vs flat()`: This benchmark compares the performance of using the spread operator (`...`) in the `Array.prototype.reduce()` method versus using the `flat()` method.
2. `Spread operator`: This individual test case measures the performance of using the spread operator (`...`) to create a new array.

**Options Compared**

In this benchmark, two options are compared:

1. **`reduce()` with spread operator**: This option uses the spread operator (`...`) to expand the input arrays into an array of arguments for the `reduce()` method.
2. **`flat()`**: This option uses the `flat()` method to flatten the input arrays.

**Pros and Cons**

Here's a brief analysis of each option:

1. **`reduce()` with spread operator**:
	* Pros:
		+ Flexible, as it can handle any number of input arrays.
		+ Can be used for more complex transformations beyond just flattening.
	* Cons:
		+ May incur overhead due to the need to create a new array and iterate over the input arrays.
2. **`flat()`**:
	* Pros:
		+ Fast, as it's optimized for performance and directly returns a flattened array.
	* Cons:
		+ Can only handle 2D arrays, which might limit its flexibility.

**Library**

There is no specific library mentioned in the benchmark definition or test cases. However, both `reduce()` and `flat()` are built-in methods of the Array prototype in JavaScript.

**Special JS Feature/Syntax**

The spread operator (`...`), used in both options, is a relatively recent addition to JavaScript (introduced in ECMAScript 2015). It allows you to expand an array or object into individual elements for use in a function call or as an argument.

**Other Alternatives**

For flattening arrays, other alternatives besides `flat()` and the spread operator include:

* Using `Array.prototype.concat()`: This method can be used in combination with `reduce()` or by manually concatenating arrays.
* Using `Array.prototype.slice()` and `Array.prototype.push()`: This approach requires manual iteration over the input arrays and pushing elements into a new array.

However, these alternatives may incur additional overhead and are less efficient than using `flat()` for simple flattening tasks.

Overall, the benchmark provides a useful comparison between two common methods for flattening arrays in JavaScript.

Related benchmarks:

reduce spread vs flat() (version: 0)

Comparing performance of: Spread operator vs Flat

Created: 3 years ago by: Registered User

Jump to the latest result

Spread operator

Flat

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):