Benchmark: Array concat vs spread operator vs push timings

Tests:

Array.prototype.concat
var params = [ 1, 2, 3 ]; var other = params.concat(4, 5); console.log(other);
spread operator
var params = [ "hello", true, 7 ] var other = [ ...params, 4, 5 ] console.log(other);
Push
var params = [ "hello", true, 7 ]; params.push(4, 5) var other = params; console.log(other);

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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 Overview**

The benchmark is designed to compare the performance of three different ways to concatenate arrays in JavaScript:

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

**Options Compared**

Each test case measures the execution time of a specific code snippet, which demonstrates one of these three methods for concatenating an array.

* **Array.prototype.concat()**: This method creates a new array by copying elements from the original array and appending new elements to it.
* **Spread operator (`...` syntax)**: This method uses the spread operator to create a new array by copying elements from the original array and spreading new elements into the new array.
* **Push()**: This method modifies the original array by pushing new elements onto its end.

**Pros and Cons of Each Approach**

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

* **Array.prototype.concat()**:
	+ Pros: Simple, well-known, and widely supported.
	+ Cons: Creates a new array, which can be memory-intensive for large arrays.
* **Spread operator (`...` syntax)**:
	+ Pros: Efficient, as it creates a new array without modifying the original one.
	+ Cons: May not work as expected in all browsers or JavaScript environments (e.g., older versions of Internet Explorer).
* **Push()**:
	+ Pros: Modifies the original array in place, which can be beneficial for large datasets.
	+ Cons: May lead to unexpected behavior if not used carefully, as it modifies the original array.

**Library and Purpose**

There are no specific libraries mentioned in this benchmark. However, some browsers may include internal optimizations or polyfills that affect the performance of these methods.

**Special JS Features or Syntax**

The spread operator (`...` syntax) is a relatively recent addition to JavaScript, introduced in ECMAScript 2015 (ES6). It allows you to create a new array by spreading elements from an existing array or other iterable into a new array.

**Other Alternatives**

In addition to the three methods mentioned in this benchmark, there are other ways to concatenate arrays in JavaScript:

* **Array.prototype.push()**: This method modifies the original array by pushing one or more elements onto its end. However, as mentioned earlier, it can lead to unexpected behavior if not used carefully.
* **Array.prototype.splice()**: This method modifies the original array by removing and replacing elements with new ones. While it's not typically used for concatenation, it can be used in some cases.

Keep in mind that these alternatives may have different performance characteristics or trade-offs compared to the methods tested in this benchmark.

Related benchmarks:

Array concat vs spread operator vs push timings (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>

Fastest: N/A

Slowest: N/A

No previous run results

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