Benchmark: Array.prototype.concat vs spread operatordsvsdxvse

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: 5 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 YaBrowser/19.3.1.887 Yowser/2.5 Safari/537.36

Browser/OS: Yandex Browser 19 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	4913127.5 Ops/sec
spread operator	27900776.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**What is being tested?**

The provided JSON represents a benchmark test on the Array.prototype.concat method and the new ES6 spread operator. The test compares the performance of these two approaches in concatenating an array with another array containing some elements.

**Options compared:**

Two options are being compared:

1. **Array.prototype.concat()**: This is the traditional method for concatenating arrays in JavaScript. It takes multiple arrays as arguments and returns a new array that contains all the elements from both arrays.
2. **Spread operator (new ES6 syntax)**: The spread operator (`...`) allows you to expand an iterable (such as an array) into separate arguments to a function, or merge two iterables into a single one.

**Pros and cons of each approach:**

1. **Array.prototype.concat()**:
	* Pros:
		+ Wide browser support
		+ Easy to use and understand
	* Cons:
		+ May not be as efficient as the spread operator, especially for large arrays
2. **Spread operator (new ES6 syntax)**:
	* Pros:
		+ More concise and readable
		+ Can be faster than concat() for large arrays
	* Cons:
		+ May not work in older browsers that don't support ES6+
		+ Requires a good understanding of the new syntax

**Library usage:**

There is no explicit library used in this benchmark. However, it's worth noting that some browser engines may use internal libraries or optimizations for array manipulation.

**Special JS features or syntax:**

The spread operator (`...`) is a relatively new feature introduced in ECMAScript 2015 (ES6). It allows you to expand an iterable into separate arguments to a function, making code more concise and readable. However, it may not work in older browsers that don't support ES6+.

**Other alternatives:**

If the spread operator is not supported, other alternatives for concatenating arrays include:

1. Using `Array.prototype.push()`: You can use `push()` method to add elements to an array.
```javascript
var arr = [1, 2];
arr.push(3);
```
2. Using `Array.prototype.concat()` with multiple arguments: This is similar to the spread operator, but uses separate function calls instead of a single expression.
```javascript
var arr = [1, 2];
var newArr = Array.prototype.concat.apply([], [arr]);
newArr.push(3);
```
In conclusion, the benchmark test compares two approaches for concatenating arrays in JavaScript: the traditional `Array.prototype.concat()` method and the new ES6 spread operator. The spread operator offers better performance and conciseness but requires a good understanding of the new syntax and may not work in older browsers.

Related benchmarks:

Array.prototype.concat vs spread operatordsvsdxvse (version: 0)

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

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

Created: 5 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):