Benchmark: js push vs concat 2

Tests:

concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ]; var final = other.concat(params);
spread
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ]; var final = [...other, ...params];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
concat
spread

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.96 Safari/537.36

Browser/OS: Chrome 88 on Mac OS X 10.14.6

View result in a separate tab

Test name	Executions per second
concat	6667241.5 Ops/sec
spread	19209352.0 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 benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark, titled "js push vs concat 2", compares two approaches to concatenate arrays in JavaScript:

1. Using `concat()`
2. Using array spread syntax (`[...array, ...other]`)

**What's Being Tested?**

In the individual test cases, we see a small script that prepares some parameters and then performs the concatenation operation using both approaches.

Here's what's happening in each test case:

1. `concat()`
```javascript
var params = [ "hello", true, 7 ];
var other = [ 1, 2 ];
var final = other.concat(params);
```

In this approach, `params` is an array that contains a string, a boolean, and an integer. It's then concatenated with the `other` array using the `concat()` method.

2. Array Spread Syntax (`[...array, ...other]`)
```javascript
var params = [ "hello", true, 7 ];
var other = [ 1, 2 ];
var final = [...other, ...params];
```

In this approach, we use the array spread syntax to create a new array that contains all elements from `other` followed by all elements from `params`.

**Options Compared**

We're comparing two options:

* **Method 1: Using `concat()`**
	+ Pros:
		- Widely supported across browsers and versions
		- Can be used with other array methods (e.g., `slice()`, `join()`)
	+ Cons:
		- May create a new array object, which can lead to performance overhead in some cases
		- Can be less efficient than the spread syntax for large arrays
* **Method 2: Array Spread Syntax (`[...array, ...other]`)**

Pros:

* More concise and expressive than `concat()`
* Can lead to better performance for large arrays (since it avoids creating a new array object)
* Is a modern JavaScript feature that's widely supported across browsers and versions

Cons:

* May not be supported in older browsers or versions
* Requires a newer JavaScript engine to execute efficiently

**Other Considerations**

When choosing between these two approaches, consider the following factors:

* **Performance**: For large arrays, the spread syntax might lead to better performance due to reduced overhead.
* **Readability**: The array spread syntax can be more concise and easier to read than `concat()`.
* **Browser Support**: Make sure you're targeting a compatible browser version.

**Library**

There is no explicit library mentioned in this benchmark. However, the use of JavaScript's built-in features (e.g., array methods, string interpolation) suggests that the tests are focused on measuring the performance of vanilla JavaScript code.

**Special JS Feature or Syntax**

The spread syntax (`[...array, ...other]`) is a modern JavaScript feature introduced in ECMAScript 2015. It allows for creating new arrays by spreading elements from existing arrays into a new array.

If you're interested in exploring alternative approaches, here are some additional options:

* **Using `Array.prototype.push()`**: Instead of concatenating arrays using the spread syntax or `concat()`, you can use `push()` to add elements to an array. However, this approach would require modifying the original array and might lead to performance overhead.
* **Using other library functions**: Depending on your specific requirements, you might consider using alternative libraries like Lodash or Ramda for array operations.

I hope this explanation helps!

Related benchmarks:

js push vs concat 2 (version: 0)

Comparing performance of: concat vs spread

Created: 3 years ago by: Guest

Jump to the latest result

concat

spread

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):