Benchmark: Array.prototype.concat vs spread operator 2

Tests:

Array.prototype.concat
var params = [ "hello", true, 7 ]; var params2 = [ 1, 2 ] var other = params2.concat(params);
spread operator
var params = [ "hello", true, 7 ] var params2 = [ 1, 2 ] var other = [ ...params2, ...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

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Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):

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Let's break down the benchmark test case.

**What is being tested:**
The provided JSON represents a benchmark test case that compares two different ways of concatenating arrays in JavaScript:

1. Using the `Array.prototype.concat()` method (`concat()`)
2. Using the ES6 spread operator (`[ ...array, ...array ]`)

**What options are compared:**

* **Option 1:** `Array.prototype.concat()` method
	+ Pros:
		- Widely supported in older browsers and environments (pre-ES6)
		- Easy to read and understand for developers familiar with traditional array manipulation methods
	+ Cons:
		- May be slower than the spread operator in modern browsers, especially when concatenating large arrays
* **Option 2:** ES6 spread operator (`[ ...array, ...array ]`)
	+ Pros:
		- Generally faster than `concat()` in modern browsers and environments (ES6+)
		- More concise and expressive code for developers familiar with the syntax
	+ Cons:
		- Not supported in older browsers and environments (pre-ES6)

**Library used:**
None. This benchmark test case only uses built-in JavaScript methods and features.

**Special JS feature or syntax:**
The ES6 spread operator (`[ ...array, ...array ]`) is a special JavaScript feature introduced in ECMAScript 2015 (ES6). It allows creating a new array by spreading the elements of one or more arrays into it. This syntax is also used in other contexts, such as destructuring arrays and objects.

**Other alternatives:**
While not directly tested in this benchmark, there are other ways to concatenate arrays in JavaScript:

* Using `push()` method: `array1.push(...array2)` (modern browsers and environments)
* Using the `concat()` method with an empty array: `[ ...array1, ...array2 ]` ( older browsers and environments)

Keep in mind that these alternatives might have performance implications or differences in browser support.

The test case uses two different approaches to concatenate arrays, and the results show that the spread operator is faster than the traditional `concat()` method in this specific scenario. However, it's essential to consider the broader context of your application, including browser support, code readability, and potential performance implications when choosing between these methods.

Related benchmarks:

Array.prototype.concat vs spread operator 2 (version: 0)

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

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

Created: 7 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):