Benchmark: Array concat vs spread operator vs push 13123123123

Tests:

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

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.45 Safari/537.36

Browser/OS: Chrome 96 on Windows

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	6441356.5 Ops/sec
spread operator	4904137.5 Ops/sec
Push	4044874.8 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its options.

**Benchmark Overview**

The benchmark is designed to compare three approaches for concatenating arrays in JavaScript:

1. `Array.prototype.concat()`
2. The new ES6 spread operator (`...`)
3. The `push()` method with multiple arguments using the `...` spread syntax

**What's being tested?**

These options are compared in terms of execution speed, efficiency, and potentially other factors such as code readability, memory usage, or performance variability across different browsers or devices.

**Options Comparison**

Here's a brief overview of each option:

### 1. `Array.prototype.concat()`

* Traditional method for concatenating arrays.
* Involves creating a new array object with the concatenated elements.
* Generally considered less efficient than modern alternatives due to its overhead and potential creation of unnecessary intermediate objects.

Pros: Widely supported, easy to understand, and familiar to most developers.
Cons: Potentially slower and more memory-intensive compared to newer methods.

### 2. The spread operator (`...`)

* Introduced in ES6 for spreading array elements into a new array or object.
* Involves creating a new array with the concatenated elements by simply copying each element from the source arrays.
* Generally considered an efficient and modern alternative to traditional concatenation methods.

Pros: Efficient, concise, and easy to read. Reduces memory allocations compared to `concat()`.
Cons: May not work as expected if used incorrectly (e.g., when using `Array.prototype.concat()` with spread operator syntax).

### 3. The `push()` method with multiple arguments (`...`)

* Involves pushing all elements from the source arrays onto the end of the target array.
* Creates a new array object, but with less overhead than traditional concatenation due to its direct manipulation of the underlying array.

Pros: Efficient for large arrays and can be more readable than `concat()` or spread operator syntax.
Cons: May require understanding of how `push()` works and handling edge cases (e.g., when using it incorrectly).

**Library usage**

None of the provided test cases use any external libraries. The tests are self-contained within the JavaScript code.

**Special JS features or syntax**

The benchmark uses ES6 spread operator (`...`) syntax, which is a relatively recent addition to the language. This allows for concise and efficient array concatenation. There's no mention of other special JavaScript features like async/await, Promises, or modern web APIs.

**Other alternatives**

If you're interested in exploring alternative approaches to array concatenation, consider:

* `Array.prototype.slice()` with `concat()`: A more verbose approach that involves creating a new array object using `slice()` and then concatenating it.
* Using `Array.from()` with spread operator syntax: This can be an efficient way to create a new array from an iterable source, but may not directly address the question of array concatenation.

For most modern web development use cases, the spread operator (`...`) or `push()` method with multiple arguments should be suitable choices for array concatenation.

Related benchmarks:

Array concat vs spread operator vs push 13123123123 (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: 3 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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