Benchmark: concat vs spread operator vs push 3

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator
Push

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 provided benchmark JSON and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark is comparing three different approaches to concatenate or manipulate an array:

1. **Concatenation using `Array.prototype.concat()`**: This method creates a new array by copying elements from another array.
2. **Spread operator (`...`)**: This is a new syntax introduced in ES6 that allows you to spread elements of an array into multiple places, including arrays and objects.
3. **Push method**: This method adds one or more elements to the end of an existing array.

**Options Compared**

The benchmark is comparing these three approaches for the following scenarios:

* Concatenating a string (`"hello"` ) with an array `[1, 2]`
* Creating a new array by spreading elements from another array

**Pros and Cons of Each Approach:**

1. **Array.prototype.concat()**
	* Pros:
		+ Well-established and widely supported.
		+ Easy to read and understand.
	* Cons:
		+ Creates a new array, which can be inefficient for large arrays.
		+ Can lead to performance issues if the original array is modified concurrently.
2. **Spread operator (`...`)**
	* Pros:
		+ More concise and expressive than `concat()`.
		+ Avoids creating a new array, reducing memory allocation overhead.
	* Cons:
		+ Less widely supported (older browsers may not understand it).
		+ Can be less readable for those unfamiliar with the syntax.
3. **Push method**
	* Pros:
		+ Fast and efficient, as it modifies the existing array.
	* Cons:
		+ May be less readable due to the use of `push()` instead of concatenation.
		+ Can lead to unexpected side effects if not used carefully.

**Library and Special JS Features**

The benchmark uses no external libraries. However, it does rely on a special JavaScript feature: the spread operator (`...`), which is a new syntax introduced in ES6.

If you're using an older browser or environment that doesn't support ES6 features, this benchmark may not run as expected.

**Alternatives**

Other alternatives for concatenating arrays or manipulating elements include:

* Using `Array.prototype.push()` with multiple arguments (e.g., `[1, 2].push('hello')`).
* Using `String.prototype.concat()` (although this is less common and less efficient than `concat()`)

Related benchmarks:

concat vs spread operator vs push 3 (version: 0)

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

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

Created: 5 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Push

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):