Benchmark: Array multi concat vs spread operator

Tests:

Array.prototype.concat
var params1 = [ "hello", true, 7 ]; var params2 = [ "hello", true, 7 ]; var params3 = [ "hello", true, 7 ]; var other = [].concat(params1, params2, params3);
spread operator
var params1 = [ "hello", true, 7 ]; var params2 = [ "hello", true, 7 ]; var params3 = [ "hello", true, 7 ]; var other = [...params1, ...params2, ...params3]

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Suite status: <idle, ready to run>

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Test case name	Result
Array.prototype.concat
spread operator

Fastest: N/A

Slowest: N/A

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

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Let's break down the benchmark and its test cases.

**What is being tested?**

The website MeasureThat.net is comparing two approaches for concatenating arrays in JavaScript:

1. The traditional `concat()` method
2. The new ES6 spread operator (`...`)

The goal of the benchmark is to determine which approach is faster, more efficient, and less resource-intensive.

**Options compared:**

The two options being compared are:

* **Array.prototype.concat()**: a built-in JavaScript method for concatenating arrays.
* **Spread operator (...)**: a new feature introduced in ECMAScript 2015 (ES6) that allows for spreading array elements into new arrays.

**Pros and cons of each approach:**

**1. Array.prototype.concat():**
	* Pros:
		+ Wide browser support, as it's a built-in method.
		+ Simple to use and understand.
	* Cons:
		+ Can be slower than the spread operator due to its implementation details (more overhead, e.g., creating a new array).
		+ May incur additional memory allocation.

**2. Spread operator (...):**
	* Pros:
		+ Faster and more efficient than `concat()` for most use cases.
		+ Reduces memory allocation, as it creates new arrays on the fly.
		+ More concise and readable code.
	* Cons:
		+ Requires ECMAScript 2015 support (ES6+) in older browsers or environments.
		+ May have minor performance differences depending on the browser's implementation.

**Library usage:**

None of the test cases explicitly use any third-party libraries. The spread operator is a built-in JavaScript feature, and `Array.prototype.concat()` is also a native method.

**Special JS features or syntax:**

The spread operator (`...`) uses a special syntax in JavaScript. It was introduced in ECMAScript 2015 (ES6) as a way to create new arrays from existing ones by spreading array elements into a new array.

**Benchmark preparation code:**

There is no script preparation code provided for the benchmark, which means that the setup and initialization of variables are not automated. The test cases rely on manual input or external configuration files.

**Other alternatives:**

If you need to concatenate arrays in JavaScript, there are other approaches:

1. **Array.prototype.push()**: adds elements to an array and returns the new length of the array.
2. **Array.from()**: creates a new array from an iterable (e.g., string, object) or an existing array.
3. **for...of loop** with Array.prototype.values(): iterates over an array and can be used for concatenation.

These alternatives may have varying performance characteristics depending on the specific use case and browser implementation.

Keep in mind that the spread operator is generally considered a better choice than `concat()` due to its efficiency and conciseness, but it's essential to consider your target audience and environment when choosing an approach.

Related benchmarks:

Array multi concat vs spread operator (version: 0)

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

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

Created: 2 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 llama3.2:3b, generated one year ago):