Benchmark: Array concat vs spread operator vs push #3

Tests:

spread operator
var other = [ 1, 2 ] var other2 = [...other, 3] var other3 = [...other, 4]
Push
var other = [ 1, 2 ]; other.push(3); other.push(4);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread operator
Push

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down what's being tested in the provided JSON.

**Benchmark Definition:**
The benchmark is testing three different approaches to concatenate arrays in JavaScript:

1.  **ES6 Spread Operator (`[...other, 3]` and `[...other, 4]`)**: This approach uses the spread operator (`...`) to create a new array by copying elements from an existing array (`other`) and adding one or more elements.
2.  **Traditional `concat()` method (`var other2 = [1, 2].concat([3])`)**: This approach uses the `concat()` method to concatenate two arrays.
3.  **`push()` method**: This approach uses the `push()` method to add one or more elements to an existing array.

**Comparison Options and Their Pros/Cons:**

*   **ES6 Spread Operator vs Traditional `concat()` Method:** The spread operator is generally faster than the traditional `concat()` method because it avoids creating a new intermediate array. However, the spread operator might be less predictable for developers unfamiliar with it.
*   **ES6 Spread Operator vs Push Method:** The spread operator is likely to be faster than the push method since it creates a new array with minimal overhead, whereas push creates a new array at the end of the existing one, which may incur additional cost.

**Library Usage:**
There is no explicit library mentioned in the benchmark definition. However, the test cases use JavaScript's built-in array methods (`concat()`, `push()`, and spread operator).

**Special JS Features/Syntax:**
The benchmark uses the ES6 spread operator (`[...other, 3]` and `[...other, 4]`). The ES6 spread operator was introduced in ECMAScript 2015 (ES6) to provide a concise way of creating new arrays from existing ones.

**Alternatives:**
If you need to concatenate arrays in JavaScript, the following alternatives can be considered:

*   Using `Array.prototype.concat()`: This method is similar to the traditional `concat()` approach mentioned in the benchmark definition.
*   Using `Array.prototype.push()`: As mentioned earlier, this approach involves adding elements to an existing array using `push()`, which might not be as efficient as the spread operator or traditional `concat()` methods.

In summary, the benchmark tests three different approaches to concatenate arrays in JavaScript, comparing their performance. The ES6 spread operator is likely to outperform the push method and traditional `concat()` method due to its concise syntax and minimal overhead.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36

Browser/OS: Chrome 86 on Mac OS X 10.15.6

View result in a separate tab

Test name	Executions per second
spread operator	14953080.0 Ops/sec
Push	48609910.0 Ops/sec

Related benchmarks:

Array concat vs spread operator vs push #3 (version: 0)

Compare the new ES6 spread operator with the traditional concat() method and push

Comparing performance of: spread operator vs Push

Created: 3 years ago by: Guest

Jump to the latest result

spread operator

Push

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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