Benchmark: Benchmark with such name already exists.

Tests:

Array.prototype.concat
var a = 'ES2015'; var b = "Hello ".concat(a);
spread operator
var a = 'ES2015'; var b = "Hello " + a;

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 (iPhone; CPU iPhone OS 14_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 14 on iOS 14.0

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	327275328.0 Ops/sec
spread operator	337573888.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to explain what's being tested in the provided benchmark.

**Benchmark Definition**

The benchmark is comparing two approaches for concatenating strings: the traditional `concat()` method on the `Array.prototype` and the new ES6 spread operator (`...`). The benchmark definition itself doesn't contain any code, but it provides a description of the test case. In this case, the description mentions that the test is comparing the performance of these two methods.

**Options Compared**

The two options being compared are:

1. **Traditional `concat()` method**: This method is part of the `Array.prototype` and has been around since ECMAScript 5 (2009). It takes multiple arguments as separate strings, concatenating them together.
2. **ES6 spread operator (`...`)**: Introduced in ECMAScript 2015 (2015), this operator allows for spreading elements into an array or object.

**Pros and Cons**

Here are some pros and cons of each approach:

* **Traditional `concat()` method**:
	+ Pros: Simple, widely supported, and easy to use.
	+ Cons: Can be slower than the spread operator due to string concatenation overhead.
* **ES6 spread operator (`...`)**:
	+ Pros: More concise, faster execution time, and better performance for large datasets.
	+ Cons: Less familiar to older browsers and versions of JavaScript.

**Library**

There is no library being used in this benchmark. The test cases only involve standard JavaScript syntax.

**Special JS Feature/Syntax**

The ES6 spread operator (`...`) is a special feature introduced in ECMAScript 2015 (2015). It's used for spreading elements into an array or object, and it provides a more concise alternative to traditional methods like `concat()`.

**Other Considerations**

When choosing between the two approaches, consider the trade-off between simplicity, performance, and readability. For small strings, the difference in performance might not be significant, but for large datasets, the spread operator can provide a noticeable advantage.

For developers who are new to JavaScript or haven't worked with ES6 syntax before, it's essential to understand that older browsers may not support the spread operator. In such cases, sticking with traditional methods like `concat()` is a safer choice.

**Other Alternatives**

In this benchmark, other alternatives aren't explicitly mentioned. However, some additional options could be considered:

* Using the `join()` method instead of concatenating strings directly.
* Employing a custom string concatenation function or library for better performance.
* Using Web Workers to parallelize string concatenation tasks and improve overall performance.

It's worth noting that the spread operator is now supported in most modern browsers, including Internet Explorer 11 (for ES6+), Chrome, Firefox, Safari, and Edge. If you're targeting an older audience or specific browser versions, using traditional methods like `concat()` might be a better choice.

Related benchmarks:

Benchmark with such name already exists. (version: 0)

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

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

Created: 4 years ago by: Registered User

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):