Benchmark: Spread vs Push when adding into array

Tests:

Spread
let array = [1,2,3]; array = [...array, 4];
Push
let array = [1,2,3]; array.push(4)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread
Push

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Spread	49814516.0 Ops/sec
Push	76966912.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**What is being tested?**

The provided benchmark tests two approaches to add an element to an array:

1.  **Spread syntax**: The first test case uses the spread operator (`...`) to create a new array and add the element `4` to it, assigning the result back to the original `array`.
2.  **Push method**: The second test case uses the `push()` method to add the element `4` to the end of the original `array`.

**Options compared**

The benchmark compares two approaches:

*   Spread syntax (`...` operator)
*   Push method (`array.push(4)`)

**Pros and Cons of each approach:**

1.  **Spread syntax (`...` operator)**

*   Pros:
        *   More concise and expressive than using `push()`.
        *   Can be more efficient in certain cases, as it avoids the overhead of a function call.
    *   Cons:
        *   May have performance implications when dealing with large arrays or high-speed iterations.
2.  **Push method (`array.push(4)`)**

*   Pros:
        *   Widely supported and well-established.
        *   Can be more predictable in terms of performance, as it's a built-in method with a clear behavior.
    *   Cons:
        *   Less concise than the spread syntax.
        *   May have overhead due to the function call.

**Other considerations:**

1.  **Library usage**: The test case does not explicitly use any external libraries or frameworks.
2.  **Special JS features or syntax**: Neither of the two approaches uses special JavaScript features or syntax beyond the standard ECMAScript language.

**Alternatives:**

If you're interested in exploring alternative approaches, consider:

1.  Using `unshift()` instead of `push()`, which adds an element to the beginning of the array.
2.  Employing a different data structure, such as an object or a set, if performance-critical code requires efficient insertion operations.

**Benchmark preparation code and JSON**

The provided JSON defines the benchmark:

```json
{
    "Name": "Spread vs Push when adding into array",
    "Description": null,
    "Script Preparation Code": null,
    "Html Preparation Code": null
}
```

And it contains individual test cases in the following format:

```json
[
    {
        "Benchmark Definition": "let array = [1,2,3];\r\narray = [...array, 4];",
        "Test Name": "Spread"
    },
    {
        "Benchmark Definition": "let array = [1,2,3];\r\narray.push(4)",
        "Test Name": "Push"
    }
]
```

**Latest benchmark result**

The provided latest benchmark result:

```json
[
    {
        "RawUAString": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
        "Browser": "Chrome 120",
        "DevicePlatform": "Desktop",
        "OperatingSystem": "Mac OS X 10.15.7",
        "ExecutionsPerSecond": 76966912.0,
        "TestName": "Push"
    },
    {
        "RawUAString": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
        "Browser": "Chrome 120",
        "DevicePlatform": "Desktop",
        "OperatingSystem": "Mac OS X 10.15.7",
        "ExecutionsPerSecond": 49814516.0,
        "TestName": "Spread"
    }
]
```

Related benchmarks:

Spread vs Push when adding into array (version: 0)

Comparing performance of: Spread vs Push

Created: 2 years ago by: Guest

Jump to the latest result

Spread

Push

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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