Benchmark: Array concat vs spread operator for 2 arrays

Tests:

Array.prototype.concat
var params = [ "hello", true, 7 ]; var params2 = [ "buy", false, 5 ]; var other = params.concat(params2);
spread operator
var params = [ "hello", true, 7 ]; var params2 = [ "buy", false, 5 ]; var other = [ ...params, ...params2 ]

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: 4 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36

Browser/OS: Chrome 83 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	3367308.2 Ops/sec
spread operator	12681555.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

The provided JSON represents two benchmark test cases:

1. **Array concat vs spread operator for 2 arrays**
This benchmark compares the performance of two methods to concatenate two arrays:
	* The traditional `concat()` method
	* The new ES6 spread operator (`...`)

**Options being compared:**

* Traditional `concat()` method
* Spread operator (`...`)
* Both methods are used to concatenate two arrays, `params` and `params2`

**Pros and Cons of each approach:**

1. **Traditional `concat()` method:**
	+ Pros:
		- Wide support across browsers and versions
		- Easy to understand and use
	+ Cons:
		- Can be slower due to the need for a function call
		- May incur additional overhead if the `concat` method is not optimized
2. **Spread operator (`...`):**
	* Pros:
		+ Faster execution time due to the syntax's nature (no function calls)
		+ More concise and readable code
	+ Widely supported in modern browsers and JavaScript engines
	* Cons:
		- May require more time for older browsers or environments that don't support it

**Library usage:**

In this benchmark, there is no explicit library usage. The spread operator (`...`) is a built-in feature introduced in ES6.

**Special JS features or syntax:**

The spread operator (`...`) is a new JavaScript feature introduced in ES6, which allows for more concise and expressive array creation.

**Benchmark preparation code:**

There is no preparation code provided in the JSON. This means that the benchmark tests are likely to be simple and focused on comparing the performance of the two methods without any additional setup or processing.

**Other alternatives:**

If you're interested in exploring alternative approaches, here are a few:

1. **Array.prototype.push()**: Another traditional method for concatenating arrays, which might incur similar overhead as `concat()`.
2. **Array.from() + spread operator**: Using `Array.from()` to create an array from an iterable (in this case, the spread operator) could provide another perspective on array creation.
3. **Custom implementation**: Developing a custom function for array concatenation could help identify performance bottlenecks and optimize the approach.

Keep in mind that these alternatives might introduce additional complexity or variations in execution times compared to the traditional `concat()` method and the spread operator.

Overall, this benchmark provides a useful comparison of two popular methods for array concatenation, allowing users to gauge the performance differences between them.

Related benchmarks:

Array concat vs spread operator for 2 arrays (version: 0)

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

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

Created: 4 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 one month ago):