Benchmark: Array concat vs spread operator vs push - single element

Tests:

Array.prototype.concat
var param = [ 3 ]; var other = [ 1, 2 ].concat(param);
spread operator
var param = [ 3 ] var other = [ 1, 2, ...param ]
Push
var param = 3; var other = [ 1, 2 ].push(param);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator
Push

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.88 Safari/537.36

Browser/OS: Chrome 79 on Mac OS X 10.15.2

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	8292588.5 Ops/sec
spread operator	35842940.0 Ops/sec
Push	41053036.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark compares three ways to concatenate or manipulate arrays in JavaScript:

1. `push` method
2. ES6 spread operator (`...`)
3. `concat()` method

**Library Used**

In this benchmark, the `Array.prototype.concat()` method is used as a library function, which means it's being tested against other implementations of array concatenation.

**Special JS Feature or Syntax**

The benchmark uses the ES6 spread operator (`...`), which is a relatively new feature introduced in JavaScript. The spread operator allows you to expand an iterable (such as an array) into individual elements, and can be used to create new arrays by spreading existing arrays.

**Options Compared**

Here's a brief overview of each option being compared:

1. `push()` method: This is the traditional way to add elements to an array in JavaScript. It modifies the original array.
2. ES6 spread operator (`...`): As mentioned earlier, this allows you to expand an iterable into individual elements and create new arrays by spreading existing arrays.
3. `concat()` method: This method returns a new array that is a copy of the original array, with additional elements added at the end.

**Pros and Cons**

Here's a brief summary of the pros and cons of each option:

1. `push()` method:
	* Pros: Fast, straightforward, and widely supported.
	* Cons: Modifies the original array, which can be undesirable in some cases (e.g., if you need to preserve the original data).
2. ES6 spread operator (`...`):
	* Pros: Creates a new array, preserving the original data. Can be more readable than `concat()` for simple cases.
	* Cons: Newer feature, may not be supported in older browsers or environments. Can be slower than `push()` or `concat()`.
3. `concat()` method:
	* Pros: Returns a new array, preserving the original data. Can be faster than `push()` for large datasets.
	* Cons: May create unnecessary intermediate arrays (if used with multiple concatenations), which can lead to performance issues.

**Benchmark Results**

The latest benchmark results show that:

1. `push()` method is the fastest option on this benchmark, followed closely by the `concat()` method.
2. The ES6 spread operator (`...`) is slower than both `push()` and `concat()`, likely due to its newer feature status and potential overhead.

**Other Alternatives**

If you're looking for alternative ways to concatenate or manipulate arrays in JavaScript, here are a few options:

* `Array.prototype.splice()` method: This method modifies the original array by replacing elements at a specified index. It's similar to `push()`, but with more flexibility.
* `Array.prototype.slice()` method: This method returns a shallow copy of a portion of an array. It can be used in conjunction with other methods, such as `concat()`, to create new arrays.
* Native libraries like `Buffer` or `TypedArray`: For specific use cases, you may want to consider using native libraries for optimized performance and memory usage.

Keep in mind that these alternatives may have different trade-offs and requirements compared to the original options being tested in this benchmark.

Related benchmarks:

Array concat vs spread operator vs push - single element (version: 0)

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

Comparing performance of: Array.prototype.concat vs spread operator vs Push

Created: 4 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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