Benchmark: Array concat vs spread operator vs push 2 arrays

Tests:

Array.prototype.concat
var params = [ "hello", true, 7 ]; var params2 = [ "hello", true, 7 ]; var other = params.concat(params2);
spread operator
var params = [ "hello", true, 7 ]; var params2 = [ "hello", true, 7 ]; var other = [ ...params, ...params2 ]
Push
var params = [ "hello", true, 7 ]; var params2 = [ "hello", true, 7 ]; var other = params.push(...params2);

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 break down the provided benchmark and explain what's being tested.

**Benchmark Definition**

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

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

**Options Compared**

The benchmark compares these three options because they serve slightly different purposes and have varying performance characteristics.

* `Array.prototype.concat()` is a traditional, explicit way to concatenate arrays in JavaScript. It creates a new array instance by copying elements from both input arrays.
* The spread operator (`...`) is a newer feature introduced in ECMAScript 2015 (ES6) that allows for more concise and expressive ways to clone or merge objects and arrays. When used with an array, it "spreads" the elements of the original array into a new array.
* `push()` method with multiple arguments using the rest parameter syntax (`...`) is another way to concatenate arrays. It modifies the existing array by appending new elements from both input arrays.

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

1. **`Array.prototype.concat()`**:
	* Pros: Widely supported, easy to understand, and has been around for a long time.
	* Cons: Creates a new array instance, which can be memory-intensive for large arrays.
2. **Spread Operator (`...`)**:
	* Pros: More concise and expressive than `concat()`, creates a shallow copy of the original array, and is faster.
	* Cons: Requires modern JavaScript versions (ES6+) to work, and might not be as clear or intuitive to some developers.
3. **`push()` method with multiple arguments using the rest parameter syntax (`...`)**:
	* Pros: Similar performance characteristics to `concat()`, but modifies the existing array instead of creating a new one.
	* Cons: Not all browsers support this syntax, and it might not be as readable or maintainable for some developers.

**Libraries Used**

There is no specific library mentioned in the benchmark definition. However, if any libraries are used to enhance or optimize the performance of these approaches, they would likely depend on the implementation details of the benchmark script.

**Special JS Features or Syntax**

The spread operator (`...`) and the rest parameter syntax (`...`) with `push()` method are specific features introduced in ECMAScript 2015 (ES6) that allow for more concise and expressive ways to clone or merge objects and arrays. They require modern JavaScript versions to work.

**Other Alternatives**

There might be other approaches or libraries used to concatenate arrays, such as:

* `Array.prototype.slice()` followed by `Array.prototype.concat()`
* Using a library like Lodash or Ramda for more functional programming-style array manipulation
* Other custom implementations that take advantage of specific browser features or optimizations

Keep in mind that these alternatives are not mentioned in the provided benchmark definition and would require additional analysis to determine their performance characteristics.

Related benchmarks:

Array concat vs spread operator vs push 2 arrays (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):