Benchmark: Array.prototype.concat vs spread operator vs apply

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the benchmark and explain what's being tested.

**What is being tested?**

The provided JSON represents a JavaScript microbenchmark that compares three different approaches to concatenate arrays: `Array.prototype.concat`, the spread operator (`...`), and the `apply()` method. The benchmark is designed to measure which approach performs better in terms of execution speed.

**Options compared:**

1. **Array.prototype.concat**: This method takes two or more arrays as arguments and returns a new array containing all the elements from both arrays.
2. **Spread operator (`...`)**: This is a new syntax introduced in ES6 that allows you to expand an array into multiple arguments.
3. **apply() method**: This method applies the provided function to the given this value, with additional arguments.

**Pros and cons of each approach:**

1. **Array.prototype.concat**:
	* Pros: Well-established and widely supported; relatively easy to understand and use.
	* Cons: Can be slower than other approaches due to the overhead of creating a new array object.
2. **Spread operator (`...`)**:
	* Pros: Efficient and concise syntax; no overhead of creating a new array object.
	* Cons: May not be supported in older browsers or environments.
3. **apply() method**:
	* Pros: Can be used with functions that expect multiple arguments, but may require more boilerplate code.
	* Cons: Can be slower than the spread operator due to the overhead of function invocation.

**Library usage:**

None of the benchmark cases explicitly use any external libraries. However, it's worth noting that `Array.prototype.concat` is a built-in method on the Array prototype object in JavaScript.

**Special JS features or syntax:**

The only special feature used in this benchmark is the spread operator (`...`). This is a new syntax introduced in ES6, which allows you to expand an array into multiple arguments. The other two approaches (concat and apply) use more traditional syntax.

**Other alternatives:**

If you're interested in exploring alternative approaches for concatenating arrays, here are a few examples:

* Using `Array.prototype.push()` with the spread operator (`...`): `params.push(...[1, 2])`
* Using `Array.prototype.unshift()` with the spread operator (`...`): `params.unshift(...[1, 2])`
* Using a custom function to concatenate arrays: `concatArrays(arr1, arr2) { return [...arr1, ...arr2]; }`

These alternatives may offer better performance or readability in certain situations, but they also come with their own trade-offs and potential drawbacks.

Latest run results:

Run details: (Test run date: 2025 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36

Browser/OS: Chrome 56 on Linux

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	5707954.0 Ops/sec
spread operator	11669375.0 Ops/sec
apply	13729851.0 Ops/sec

Related benchmarks:

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

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

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

Created: 6 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

apply

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):