Benchmark: Array concat vs spread operator vs push 123457u8

Tests:

Array.prototype.concat
const result = [1,2,3,4,5,6,7,8,9,10,1,2,3,4,5,6,7,8,9,10].concat([1,2,3,4,5,6,7,8,9,10,1,2,3,4,5,6,7,8,9,10]);
spread operator
const result = [...[1,2,3,4,5,6,7,8,9,10,1,2,3,4,5,6,7,8,9,10],...[1,2,3,4,5,6,7,8,9,10,1,2,3,4,5,6,7,8,9,10]]
Push
const result = [1,2,3,4,5,6,7,8,9,10,1,2,3,4,5,6,7,8,9,10].push(...[1,2,3,4,5,6,7,8,9,10,1,2,3,4,5,6,7,8,9,10]);

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

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

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Let's dive into explaining the provided benchmark.

**Benchmark Overview**

The benchmark is designed to compare the performance of three different ways to concatenate arrays in JavaScript: `concat()`, the spread operator (`...`), and `push()`.

**Options Compared**

1. **Array.prototype.concat**: This method creates a new array by copying elements from an existing array, and then concatenating it with another array.
2. **Spread Operator (`...`)**: This is a new feature introduced in ECMAScript 2018 (ES9). It allows you to expand an array into individual elements, effectively creating a new array.
3. **Array.prototype.push()**: This method adds one or more elements to the end of an existing array.

**Pros and Cons of Each Approach**

1. **concat()**:
	* Pros: Simple, widely supported, and well-documented.
	* Cons: Creates a new array, which can be memory-intensive for large arrays.
2. **Spread Operator (`...`)**:
	* Pros: More concise, efficient, and modern.
	* Cons: Requires ECMAScript 2018 support (ES9) to be enabled in browsers or Node.js.
3. **push()**:
	* Pros: Can modify the original array, which can be more memory-efficient than creating a new one.
	* Cons: Less intuitive, requires understanding of how `push()` works.

**Library and Special JS Features**

None mentioned in the provided benchmark.

**Other Considerations**

When choosing between these approaches, consider the following:

* **Performance**: If you need to concatenate large arrays frequently, using the spread operator might be more efficient.
* **Memory usage**: Creating a new array can consume more memory than modifying an existing one with `push()`.
* **Readability and maintainability**: Using the spread operator or `concat()` is generally more concise and readable than `push()`.

**Alternatives**

If you're interested in exploring other options, consider:

1. **Array.prototype.slice() + concat()**: This method uses `slice()` to create a shallow copy of the array and then concatenates it with another array.
2. **for...of loop**: You can use a `for...of` loop to iterate over an array and concatenate its elements.
3. **Array.from()**: If you're working with older browsers or Node.js versions that don't support the spread operator, you can use `Array.from()` to create an array from an iterable.

Keep in mind that these alternatives might have slightly different performance characteristics or be more prone to errors than the original options.

Related benchmarks:

Array concat vs spread operator vs push 123457u8 (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: 4 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):