Benchmark: Array concat vs spread operator vs push (5k elements)

Script Preparation code:

var params = Array.from(5000);
var arr2 = [1,2,3];

Tests:

Array.prototype.concat
var other = []; for (let i = 0; i < params.length; i++) { other = other.concat(arr2); }
spread operator
var other = []; for (let i = 0; i < params.length; i++) { other = [...other, ...arr2]; }
Push
var other = []; for (let i = 0; i < params.length; i++) { other.push(...arr2); }

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:

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

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**Benchmark Definition**
The benchmark measures the performance of three ways to concatenate an array: the traditional `concat()` method, the new ES6 spread operator (`...`), and the `push()` method with multiple arguments.

**Options Compared**

1. **Array.prototype.concat**: This is a built-in method in JavaScript that concatenates two or more arrays.
2. **Spread Operator (ES6)**: The spread operator (`...`) is a new feature introduced in ECMAScript 2015, which allows spreading the elements of an array into a new array.
3. **Push with Multiple Arguments**: This approach uses the `push()` method to add multiple arguments to the end of an array.

**Pros and Cons**

* **Array.prototype.concat**: This is a widely supported method, but it creates a new array every time it's called, which can be inefficient for large datasets.
	+ Pros: Easy to use, widely supported
	+ Cons: Creates a new array, can be slow for large datasets
* **Spread Operator (ES6)**: This is a concise and efficient way to create a new array by spreading the elements of an existing array.
	+ Pros: Concise, efficient, and modern
	+ Cons: Requires JavaScript 2015 or later support
* **Push with Multiple Arguments**: This approach can be more memory-efficient than `concat()` for large datasets, but it's less concise and may require more code.
	+ Pros: Memory-efficient, no need to create a new array
	+ Cons: Less concise, may require more code

**Library Used**
None in this benchmark.

**Special JS Feature or Syntax**
The spread operator (`...`) is a feature introduced in ECMAScript 2015. It allows spreading the elements of an array into a new array.

**Other Alternatives**

* **Array.prototype.push() with spread syntax**: Instead of using `push()` with multiple arguments, you can use the spread operator to pass the elements as separate arguments: `other.push(...arr2)`.
* **Array.prototype.reduce()**: You can also use the `reduce()` method to concatenate arrays, although this approach is less concise than the other two.

In summary, the benchmark measures the performance of three ways to concatenate an array: `concat()`, spread operator (`...`), and `push()` with multiple arguments. The choice of approach depends on the specific use case, personal preference, and the required trade-offs between conciseness, efficiency, and memory usage.

Related benchmarks:

Array concat vs spread operator vs push (5k elements) (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):