Benchmark: Array.prototype.concat vs spread operator (withouth JQuery)

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 ]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:98.0) Gecko/20100101 Firefox/98.0

Browser/OS: Firefox 98 on Ubuntu

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	4395901.5 Ops/sec
spread operator	5480347.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark and its results in a way that's easy to understand for software engineers of various skill levels.

**Benchmark Overview**

The benchmark compares two approaches to merge arrays in JavaScript:

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

**Options Compared**

* `Array.prototype.concat()`: This is the traditional method used to merge arrays.
* Spread operator (`...`): This is a newer way of merging arrays introduced in ECMAScript 2015.

**Pros and Cons of Each Approach**

### Array.prototype.concat()

Pros:

* Well-established and widely supported.
* Easy to understand and use, especially for those familiar with array methods.

Cons:

* Can be slower due to the overhead of creating an intermediate array.
* Creates a new array, which can lead to higher memory usage.

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

Pros:

* Faster than `concat()` because it avoids creating an intermediate array.
* More concise and expressive way to merge arrays.

Cons:

* Less widely supported (older browsers might not understand the syntax).
* May be less intuitive for those without experience with spread operators.

**Library/Functionality Used**

In this benchmark, no specific library or function is used. The focus is solely on comparing two built-in JavaScript features: `Array.prototype.concat()` and the spread operator (`...`).

**Special JS Feature/Syntax**

The spread operator (`...`) is a special syntax introduced in ECMAScript 2015 (ES6). It allows you to create new arrays by spreading existing arrays or array-like objects.

**Other Considerations**

* The benchmark uses Firefox 98 as the test browser, which supports ES6 features.
* The `TestName` field suggests that this is a general-purpose benchmark, not specific to any particular use case or library.

**Alternatives**

If you're interested in similar benchmarks or want to explore other ways to merge arrays, consider the following alternatives:

1. Using `Array.prototype.push()` and `Array.prototype.length`: This method can be slower than the spread operator but is still supported by most browsers.
2. Using a custom implementation: You could write your own function to merge arrays using loops or other techniques. However, this would likely result in slower performance compared to the built-in methods.

In summary, the MeasureThat.net benchmark provides a useful comparison between two common ways to merge arrays in JavaScript: `Array.prototype.concat()` and the spread operator (`...`). By understanding the pros and cons of each approach, you can make informed decisions about which method to use in your own projects.

Related benchmarks:

Array.prototype.concat vs spread operator (withouth JQuery) (version: 0)

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

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

Created: 2 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

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):