Benchmark: Concat vs Spread for large arrays

Tests:

Spread
var params = [ "hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7 ] var params2 = [ "hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7 ] var other = [ ...params, ...params2 ]
Concat
var params = [ "hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7 ] var params2 = [ "hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7, "hello", true, 7, "hello", true, 7, "hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7,"hello", true, 7 ] var other = params.concat(params2)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread
Concat

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and the pros and cons of each approach.

**Benchmark Definition**
The benchmark is defined by two test cases: "Concat" and "Spread". Both tests compare the performance of concatenating an array using the `concat()` method versus spreading the array into a new one using the spread operator (`...`).

**Benchmark Script**
The script for both tests is identical:
```javascript
var params = [...]; // large array with 50 elements
var params2 = [...]; // same as params, but with some differences (e.g., index order)
var other = [ ...params, ...params2 ]; // concatenation using concat()
```
**Options being compared**

1. **Concat**: Uses the `concat()` method to concatenate two arrays.
2. **Spread**: Uses the spread operator (`...`) to create a new array from an existing one.

**Pros and Cons of each approach:**

* **Concat**:
	+ Pros:
		- More explicit and readable way to concatenate arrays.
		- Can be more efficient for large datasets since it avoids creating temporary arrays.
	+ Cons:
		- Can be slower than spread for very large arrays, as it involves creating multiple intermediate arrays.
		- Can lead to memory issues if not used carefully, especially in browsers with limited stack size.
* **Spread**:
	+ Pros:
		- Often faster and more efficient than concat for large datasets.
		- Creates a new array without the need for intermediate arrays, reducing memory usage.
	+ Cons:
		- Can be less explicit and readable, especially for complex concatenations.
		- May not work as expected in some older browsers or environments that don't support the spread operator.

**Benchmark Results**
The latest benchmark results show:

* **Concat**: 3676463.75 executions per second (FPS)
* **Spread**: 1310325.75 FPS

As expected, the "Concat" test performed better than the "Spread" test, which is likely due to the overhead of creating intermediate arrays using `concat()`. However, it's essential to note that this result might vary depending on the specific use case and environment.

In conclusion, while both approaches have their trade-offs, the spread operator (`...`) tends to be a more efficient choice for concatenating large datasets in modern JavaScript environments.

Related benchmarks:

Concat vs Spread for large arrays (version: 0)

Comparing performance of: Spread vs Concat

Created: 5 years ago by: Guest

Jump to the latest result

Spread

Concat

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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