Benchmark: Array.prototype.concat vs spread operator aboktor

Tests:

Array.prototype.concat
var params = [ 0,1,2,3,4,5,6,7, 8,9,0 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ 0,1,2,3,4,5,6,7, 8,9,0 ]; var other = [ 1, 2, ...params];

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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 dive into the world of JavaScript microbenchmarks.

**Benchmark Overview**

The provided benchmark compares two ways to concatenate arrays in JavaScript: the traditional `Array.prototype.concat()` method and the new ES6 spread operator (`...`).

**Options Compared**

The two options being compared are:

1. **Traditional `concat()` method**: This method creates a new array by copying elements from one or more source arrays.
2. **Spread Operator (`...`)**: This operator creates a new array by spreading out the elements of an existing array.

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

* **Traditional `concat()` method**:
	+ Pros:
		- Wide browser support (even older versions)
		- Generally faster execution due to native implementation
	+ Cons:
		- Can be slower for large arrays due to overhead of creating a new array
		- Less efficient in terms of memory allocation and deallocation
* **Spread Operator (`...`)**:
	+ Pros:
		- More concise and readable code
		- Faster execution for large arrays (since it uses native implementation)
		- Better performance for deep concatenations
	+ Cons:
		- Requires modern browsers that support the spread operator
		- May not work in older versions of Internet Explorer

**Library Usage**

In this benchmark, the `Array.prototype.concat()` method is a standard JavaScript library function. No external libraries are required to run these tests.

**Special JS Feature/Syntax**

The spread operator (`...`) is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). It's supported in most modern browsers, including Firefox 68 used in this benchmark.

**Other Considerations**

* **Array initialization**: The provided test cases use arrays initialized with literal values. In real-world scenarios, you might encounter array initialization from user input or external sources.
* **Array size**: The test case uses an array of moderate size (11 elements). You may want to consider larger or smaller array sizes to see how the performance differences between the two methods scale.

**Other Alternatives**

If you're interested in exploring other ways to concatenate arrays, here are a few alternatives:

1. `Array.prototype.push()` method: This method adds one or more elements to an existing array and returns the updated length of the array.
2. `Array.from()` method: This method creates a new array from an iterable (such as another array) or an array-like object.
3. `concat()` with `Array.isArray()`: Some developers use `Array.isArray()` to check if an object is an array before calling `concat()`.

Related benchmarks:

Array.prototype.concat vs spread operator aboktor (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: 6 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):