Benchmark: Spread vs Push in loops

Tests:

Spread
let array = []; for (let i = 0; i < 10000; i++) { array = [...array, i]; }
Push
let array = []; for (let i = 0; i < 10000; i++) { array.push(i); }

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:

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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 its various components.

**Benchmark Definition**
The benchmark definition is represented by two JSON objects, each containing a JavaScript code snippet that performs a specific operation:

1.  **Spread**: The first test case uses the spread operator (`...`) to create a new array by copying an existing array and appending a value to it. In this case, `let array = []` initializes an empty array, and the `for` loop iterates 10,000 times, adding each iteration's value to the array using `array = [...array, i];`.
2.  **Push**: The second test case uses the `push()` method to append values to an existing array. Similar to the spread example, `let array = []` initializes an empty array, and the `for` loop iterates 10,000 times, adding each iteration's value to the array using `array.push(i);`.

**Comparison of Options**

The main difference between these two approaches is how they modify the original array:

*   **Spread**: Creates a new array by copying the existing one and appending the new values. This method does not modify the original array.
*   **Push**: Modifies the original array by adding elements to its end.

**Pros and Cons**

Here are some pros and cons of each approach:

*   **Spread**:
    *   Pros:
        *   Does not modify the original array, preserving its integrity.
        *   Creates a new array, which can be beneficial for performance-critical code or when working with large datasets.
    *   Cons:
        *   Can result in higher memory usage due to the creation of a new array.
*   **Push**:
    *   Pros:
        *   Modifies the original array efficiently, reducing memory allocation and deallocation overhead.
    *   Cons:
        *   Modifies the original array, potentially affecting its integrity or performance.

**Considerations**

When deciding between these two approaches, consider the following factors:

*   Performance: If you're working with large datasets or need optimal performance, `push()` might be a better choice. However, if preserving the original array's integrity is crucial, `spread()` could be more suitable.
*   Memory usage: Keep in mind that creating a new array using `spread()` can lead to higher memory usage. If you're concerned about memory efficiency, `push()` is likely a better option.

**Library and Special JS Features**

There are no libraries mentioned in the benchmark definition. However, if you'd like to discuss other JavaScript features or libraries that could be used for similar benchmarks, please let me know!

**Alternative Benchmarking Frameworks and Tools**

Some popular alternatives to MeasureThat.net include:

*   [Benchmark.js](https://benchmarkjs.com/): A lightweight JavaScript benchmarking library.
*   [JsPerf](http://jsperf.com/): A simple JavaScript performance testing tool.
*   [WebPageTest](https://www.webpagetest.com/): A comprehensive web page performance testing and optimization tool.

These alternatives offer various features, such as support for multiple platforms, more advanced performance analysis, and integration with other tools. However, MeasureThat.net's simplicity and focus on JavaScript microbenchmarks make it a great starting point for many use cases.

Related benchmarks:

Spread vs Push in loops (version: 0)

Comparing performance of: Spread vs Push

Created: 6 years ago by: Guest

Jump to the latest result

Spread

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):