Benchmark: Array concat vs spread operator vs push v1

Tests:

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

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 (X11; Linux x86_64; rv:83.0) Gecko/20100101 Firefox/83.0

Browser/OS: Firefox 83 on Linux

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	6467943.5 Ops/sec
spread operator	5329217.0 Ops/sec
Push	8780070.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested, compared, and some of the considerations.

**Benchmark Overview**

The benchmark is designed to compare three approaches for concatenating or adding elements to an array:

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

The goal is to determine which approach is faster in various scenarios.

**Approach Comparison**

Here's a brief overview of each approach and their pros/cons:

1. **`Array.prototype.concat()`**: This is the traditional way of concatenating arrays in JavaScript. It creates a new array and copies all elements from both arrays into it.
	* Pros: Easy to understand, widely supported.
	* Cons: Creates a new array object, can be slower due to memory allocation.
2. **ES6 Spread Operator (`...`)**: This operator allows you to spread the elements of an array onto another array or an object.
	* Pros: Concise and expressive, faster than `concat()` in many cases.
	* Cons: Requires modern JavaScript versions (ECMAScript 2015+), might not be supported in older browsers.
3. **`push()` method with multiple arguments**: This approach involves calling the `push()` method on an array and passing multiple elements as separate arguments.
	* Pros: Can be faster than `concat()`, doesn't create a new array object.
	* Cons: Might require multiple `push()` calls, can lead to stack overflow errors if not used carefully.

**Library Usage**

The benchmark code uses the JavaScript engine's built-in methods and does not rely on any external libraries.

**Special JS Features or Syntax**

There are no special features or syntaxes being tested in this benchmark. The focus is solely on comparing three different approaches for concatenating or adding elements to an array.

**Alternative Approaches**

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

1. `Array.prototype.push()` with multiple arguments (as seen in the benchmark): This approach can be faster than `concat()` but requires careful usage to avoid stack overflow errors.
2. Using `Array.prototype.splice()`: Instead of concatenating two arrays, you can use `splice()` to insert elements into an existing array.
3. Using `String.prototype.concat()`: If working with strings, you can concatenate them using the `+` operator or `String.prototype.concat()`.

Keep in mind that these alternatives might not be as efficient or convenient as the approaches tested in the benchmark.

I hope this explanation helps you understand the benchmark and its test cases!

Related benchmarks:

Array concat vs spread operator vs push v1 (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: Registered User

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):