Benchmark: Array.prototype.concat vs spread operator vs push x

Tests:

Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]
Push
var params = [ "hello", true, 7 ]; params.push(1); params.push(2);

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

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared options, pros and cons of those approaches, and other considerations.

**Benchmark Overview**

The MeasureThat.net website allows users to create and run JavaScript microbenchmarks. The provided benchmark compares three methods for concatenating or pushing elements onto an array:

1. `Array.prototype.concat()`
2. The new ES6 spread operator (`...`)
3. `push()` method

**Test Cases**

There are three individual test cases, each with its own benchmark definition and test name.

1. **`Array.prototype.concat`**: This test case uses the traditional `concat()` method to concatenate an array `params` with another array `[ 1, 2 ]`.
2. **Spread Operator (`...`)**: This test case uses the spread operator (`...`) to spread elements from the `params` array onto a new array `[ 1, 2 ]`.
3. **Push**: This test case uses the `push()` method to push two elements (1 and 2) onto the `params` array.

**Options Compared**

The benchmark compares three options:

* `Array.prototype.concat()`: The traditional method for concatenating arrays.
* Spread Operator (`...`): The new ES6 feature for spreading elements onto an array.
* `push()` method: A method for adding elements to the end of an array.

**Pros and Cons**

Here's a brief summary of each option:

* **`Array.prototype.concat()`**:
	+ Pros: Well-established, widely supported, and well-documented.
	+ Cons: Can be slower than other methods due to its overhead.
* **Spread Operator (`...`)**:
	+ Pros: Fast, concise, and easy to use. It's also a modern feature that takes advantage of JavaScript's ability to create arrays from iterables.
	+ Cons: May not work as expected with older browsers or versions of JavaScript.
* **`push()` method**:
	+ Pros: Fast and efficient for adding elements to the end of an array.
	+ Cons: Not ideal for concatenating arrays, as it modifies the original array.

**Library Used**

None of these methods rely on any external libraries. They are all part of the JavaScript standard library or are built-in features.

**Special JS Feature/Syntax**

The spread operator (`...`) is a modern feature introduced in ECMAScript 2015 (ES6). It's not supported in older versions of JavaScript, so it may not work as expected on older browsers or platforms.

**Other Considerations**

When choosing between these methods, consider the following factors:

* **Performance**: If you need to concatenate arrays frequently, the spread operator might be a good choice due to its speed. However, if you're targeting older browsers or versions of JavaScript, `Array.prototype.concat()` might be a safer option.
* **Code readability and maintainability**: The spread operator can make code more concise and readable, but it may also add complexity for those unfamiliar with the syntax.
* **Browser support**: Make sure to test your application on different browsers and platforms to ensure compatibility.

**Alternatives**

If you're looking for alternative methods or libraries for array manipulation, consider:

* Lodash: A popular utility library that provides a `concat` function and other array-related helpers.
* Array.prototype.slice(): Another method for creating a shallow copy of an array.
* Underscore.js: A functional programming library that provides a `concat` function and other utility functions.

Keep in mind that these alternatives might have different performance characteristics or use more memory, so be sure to test them thoroughly in your specific use case.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36

Browser/OS: Chrome 73 on Mac OS X 10.14.4

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	6297129.5 Ops/sec
spread operator	28915560.0 Ops/sec
Push	34086204.0 Ops/sec

Related benchmarks:

Array.prototype.concat vs spread operator vs push x (version: 0)

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

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

Created: 5 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 28 days ago):