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

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark and its options, pros, cons, and considerations.

**Benchmark Overview**

The benchmark is designed to compare three different ways of adding elements to an array:

1. `Array.prototype.concat()`
2. The new ES6 spread operator (`...`)
3. `push` with spread syntax (`...`)

These methods are compared in the context of a simple test case, where an array `params` is created and then used to add elements to another array.

**Test Cases**

There are four test cases:

1. **`Array.prototype.concat()`**: This method uses the `concat` method on the `params` array and passes it as an argument.
2. **Spread Operator (`...`)**: This method uses the spread operator (`...`) to expand the `params` array into a new array, which is then assigned to `other`.
3. **Push with Spread Syntax (`...`)**: This method uses the `push` method on an empty array, passing the spread syntax (`...`) as an argument.
4. **`Push`**: This test case simply pushes elements onto the `params` array directly.

**Options Compared**

The benchmark compares the performance of these four methods:

* `Array.prototype.concat()`
* Spread Operator (`...`)
* Push with Spread Syntax (`...`)
* Simple `Push`

**Pros and Cons of Each Approach:**

1. **`Array.prototype.concat()`**:
	* Pros: Can be used to concatenate multiple arrays, flexible syntax.
	* Cons: Creates a new array, potentially inefficient for large datasets.
2. **Spread Operator (`...`)**:
	* Pros: Concise syntax, efficient for small to medium-sized datasets.
	* Cons: Not compatible with older browsers or environments without ES6 support.
3. **Push with Spread Syntax (`...`)**:
	* Pros: Efficient and concise, suitable for most modern JavaScript use cases.
	* Cons: Requires the `push` method, which can be confusing if not used before.
4. **Simple `Push`**:
	* Pros: Simple, intuitive syntax, efficient.
	* Cons: Inefficient for large datasets, may lead to performance issues.

**Library and Special Features**

There is no specific library mentioned in this benchmark. However, the use of the spread operator (`...`) assumes ES6 support.

No special JavaScript features or syntax are used in these test cases.

**Other Alternatives**

If you need alternative methods for adding elements to an array, consider:

* `Array.prototype.push()`: A more traditional and widely supported method.
* `Array.prototype.splice()`: Allows removing elements from the end of the array before pushing new ones.
* `Array.prototype.set()`: (Not available in most browsers) Can be used to add or replace multiple elements at once.

Keep in mind that each approach has its trade-offs, and the choice ultimately depends on your specific use case and requirements.

Latest run results:

Run details: (Test run date: 6 years ago)

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 11_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/11.0 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 11 on iOS 11.3

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	6032381.0 Ops/sec
spread operator	23408756.0 Ops/sec
spread push	7910140.5 Ops/sec
Push	12714621.0 Ops/sec

Related benchmarks:

Array.prototype.concat vs spread operator vs push spread (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 spread push vs Push

Created: 6 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

spread push

Push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):