Benchmark: concat vs spread 2.0

Tests:

concat
const arr1 = ['foo']; const arr2 = ['bar']; const newArr = [].concat(arr1, arr2);
spread
const arr1 = ['foo']; const arr2 = ['bar']; const spreadArr = [...arr1, ...arr2];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
concat
spread

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

I'd be happy to help explain what's being tested in this benchmark.

**Benchmark Overview**

The benchmark is designed to measure the speed difference between using the `concat` method and the spread operator (`...`) to concatenate two arrays. The goal is to determine which approach is faster.

**Options Compared**

There are only two options being compared:

1. **Concatenation with `.concat()`**: This method uses the `concat()` function to combine two or more arrays into a new array.
2. **Spread Operator (`...`)**: This method uses the spread operator to create a new array by concatenating two or more arrays.

**Pros and Cons**

* **Concatenation with `.concat()`**:
	+ Pros: More explicit and intuitive, easy to understand for developers familiar with JavaScript.
	+ Cons: Can be slower than the spread operator due to the overhead of creating a new function call.
* **Spread Operator (`...`)**:
	+ Pros: Often faster than `.concat()`, as it avoids the overhead of creating a new function call. Also, it's more concise and easier to read for many developers.
	+ Cons: May not be immediately clear to all developers, especially those without experience with JavaScript.

**Library Usage**

There is no explicit library usage in this benchmark.

**Special JS Features or Syntax**

The spread operator (`...`) was introduced in ECMAScript 2015 (ES6) and has since become a widely supported feature in modern JavaScript environments. It's also used extensively in many libraries and frameworks, including React and Angular.

**Benchmark Preparation Code**

The preparation code is empty, which means that the benchmark starts with clean arrays `arr1` and `arr2`, ready for concatenation or spreading.

**Latest Benchmark Result**

According to the latest result, the spread operator (`...`) is significantly faster than the `.concat()` method on this particular test case. This aligns with general performance trends observed in many JavaScript benchmarks, where the spread operator tends to outperform `.concat()` due to its more efficient execution path.

**Other Alternatives**

If you're interested in exploring other alternatives for array concatenation or spreading, consider using modern JavaScript methods like `Array.prototype.push()`, `Array.prototype.splice()`, or the `Array.from()` method with an iterator. However, keep in mind that these approaches might not be as concise or readable as the spread operator.

For more advanced topics, you can also investigate libraries like Lodash or Ramda, which provide optimized and performant ways to work with arrays and other data structures.

Feel free to ask if you have any further questions!

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Android 11; Mobile; rv:91.0) Gecko/91.0 Firefox/91.0

Browser/OS: Firefox Mobile 91 on Android

View result in a separate tab

Test name	Executions per second
concat	9093593.0 Ops/sec
spread	13783275.0 Ops/sec

Related benchmarks:

concat vs spread 2.0 (version: 0)

measure the speed of concat versus spread operator

Comparing performance of: concat vs spread

Created: 3 years ago by: Guest

Jump to the latest result

concat

spread

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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