Benchmark: spread() vs flat()

Tests:

spread
var params1 = [ 1, 2 ]; var params2 = [ "hello", true, 7 ]; var other = [...params1, ...params2]
Array.prototype.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
Array.prototype.flat

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Android 14; Mobile; rv:130.0) Gecko/130.0 Firefox/130.0

Browser/OS: Firefox Mobile 130 on Android

View result in a separate tab

Test name	Executions per second
spread	12489911.0 Ops/sec
Array.prototype.flat	7667757.5 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Explanation**

The benchmark measures the performance difference between two ways of spreading or flattening arrays in JavaScript:

1. **ES6 Spread Operator (`...`)**: This operator was introduced in ECMAScript 2015 (ES6) and allows you to expand an array into individual elements. In the benchmark, it's used to create a new array by concatenating `params1` and `params2`.
2. **Traditional `concat()` method**: This method is a built-in function that concatenates arrays. In the benchmark, it's used to achieve the same result as the spread operator.

**Options Compared**

The benchmark compares two approaches:

* ES6 Spread Operator (`...`)
* Traditional `concat()` method

**Pros and Cons of Each Approach**

### ES6 Spread Operator (`...`)

Pros:

* More concise and readable code
* Supports spreading arrays, objects, and maps
* Can be used with various data structures (e.g., sets, tuples)

Cons:

* Supported in most modern browsers, but may not work in older versions or Internet Explorer
* May have performance issues if the spread operator is called repeatedly

### Traditional `concat()` method

Pros:

* Works in all browsers and versions of JavaScript
* Has been around for a long time, so many developers are familiar with it

Cons:

* More verbose code compared to the spread operator
* Can lead to performance issues if used excessively or on large datasets

**Library Used**

None explicitly mentioned. The benchmark only uses built-in JavaScript functions.

**Special JS Feature/Syntax**

The benchmark uses a feature that was introduced in ECMAScript 2015 (ES6): the spread operator (`...`). It's not specific to any particular browser or version, but its usage is often associated with modern web development.

**Other Considerations**

When deciding between these two approaches, consider the trade-off between conciseness and performance. If you're working on a project that requires frequent array concatenation or flattening, using the spread operator might be a good choice. However, if you need to support older browsers or environments where the spread operator is not supported, the traditional `concat()` method is a safer option.

**Other Alternatives**

Some alternative methods for spreading arrays in JavaScript include:

* Using `Array.prototype.slice()` with two arguments (i.e., `slice(0, params1.length + params2.length)` to create a new array)
* Utilizing libraries like Lodash or Underscore.js, which provide utility functions for working with arrays
* Implementing your own array spreading algorithm using loops and array manipulation techniques

In general, the choice of method depends on the specific requirements of your project, including performance considerations, code readability, and compatibility with different browsers and environments.

Related benchmarks:

spread() vs flat() (version: 0)

Compare the new ES6 spread operator with the traditional concat() method

Comparing performance of: spread vs Array.prototype.flat

Created: one year ago by: Guest

Jump to the latest result

spread

Array.prototype.flat

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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