Benchmark: Array.prototype.concat vs splice 1

Tests:

spread operator
var a = [ "hello" ] var b = [ "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello" ] var other = a.concat(b)
jQuery merge
var a = [ "hello" ]; var b = [ "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello" ] var other = b.splice(0, 0, a[0]);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread operator
jQuery merge

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36 Edg/114.0.1823.58

Browser/OS: Chrome 114 on Windows

View result in a separate tab

Test name	Executions per second
spread operator	4999982.0 Ops/sec
jQuery merge	6337059.0 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 provided JSON and explain what is being tested, compared, and the pros and cons of each approach.

**Benchmark Definition**

The benchmark definition is represented by the `Script Preparation Code` and `Html Preparation Code` fields, which are empty in this case. This means that no specific code or HTML setup is required to run the benchmarks.

**Individual Test Cases**

There are two individual test cases:

1. **Array.prototype.concat vs splice 1**: This benchmark compares the performance of using `concat()` versus `splice()` to merge two arrays.
2. **spread operator**: This benchmark tests the performance of using the spread operator (`...`) to merge two arrays.

**Library and Special JS Features**

In both test cases, a library is used:

* In the first test case, it's not explicitly mentioned which library is being used for `splice()`, but based on the context, it's likely that jQuery is being used. If so, the purpose of jQuery in this case is to provide an alternative implementation of `splice()` for array merging.
* In the second test case, the spread operator (`...`) is a special feature introduced in ECMAScript 2018.

**Options Compared**

In both test cases, the following options are being compared:

* For the first test case:
	+ Using `concat()`
	+ Using `splice()` (with jQuery as the likely implementation)
* For the second test case:
	+ Using the spread operator (`...`)
	+ No other alternatives are mentioned

**Pros and Cons**

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

1. **Array.prototype.concat vs splice 1**
	+ `concat()`: Pros - widely supported, easy to use; Cons - may create unnecessary intermediate arrays.
	+ `splice()` (with jQuery): Pros - can be more efficient than `concat()` if implemented correctly; Cons - requires jQuery, which may not be included in all environments.
2. **spread operator**
	+ Using the spread operator (`...`): Pros - concise and expressive, creates a new array with no intermediate arrays; Cons - introduced in ECMAScript 2018, may not support older browsers.

**Other Alternatives**

In both test cases, other alternatives are not mentioned:

* For `concat()`, other alternatives might include using `Array.prototype.push()` or creating a new array using an array constructor.
* For the spread operator (`...`), alternative methods like using `Array.prototype.slice()` and concatenating arrays manually could be used.

**Considerations**

When working with array merging, consider factors such as:

* Performance: Using efficient algorithms like `concat()` or the spread operator can impact performance.
* Code readability: Choosing an approach that is easy to understand and maintain is essential.
* Browser support: Ensuring compatibility across different browsers and environments is crucial.

I hope this explanation helps software engineers understand what's being tested in MeasureThat.net's benchmark!

Related benchmarks:

Array.prototype.concat vs splice 1 (version: 0)

Comparing performance of: spread operator vs jQuery merge

Created: 6 years ago by: Guest

Jump to the latest result

spread operator

jQuery merge

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):