Benchmark: Large arrays spread vs push v2

Tests:

spread
const user = {}; user.numbers = Array.from(Array(10000).keys()); user.numbers = [...user.numbers, 10000];
push
const user = {}; user.numbers = Array.from(Array(10000).keys()); user.numbers.push(10000);

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 dive into the world of JavaScript microbenchmarks.

**Benchmark Overview**

The provided JSON represents a benchmark test for comparing two approaches: using `Array.prototype.push()` versus using array spread (`...`) to add an element to an existing array. The benchmark is designed to measure the performance difference between these two methods on large arrays.

**Options Compared**

Two options are compared:

1. **`push()` method**: This is a built-in JavaScript method that adds one or more elements to the end of an array and returns the new length.
2. **Array spread (`...`) method**: This is a feature introduced in ECMAScript 2015 (ES6) that allows you to create a new array by spreading the elements of an existing array.

**Pros and Cons**

*   **`push()` Method**
    *   Pros:
        *   Wide browser support, including older versions.
        *   Easy to implement.
    *   Cons:
        *   Can be slower for large arrays due to the need to create a temporary array and then copy its elements to the original array.
*   **Array Spread (`...`) Method**
    *   Pros:
        *   Generally faster than `push()` for large arrays, as it avoids creating a temporary array.
        *   More concise and expressive code.

However, the spread syntax requires ECMAScript 2015 (ES6) or later. If you're targeting older browsers, you may need to use the `push()` method instead.

**Library**

In this benchmark, there is no explicit library being used. However, if you were to extend this benchmark, you might consider using a library like:

**Special JS Feature or Syntax**

The spread syntax (`...`) is a feature introduced in ECMAScript 2015 (ES6). It allows you to create a new array by spreading the elements of an existing array. This syntax was added to improve code readability and expressiveness, but it may not be supported in older browsers.

**Other Considerations**

*   **Array Size**: The benchmark is designed to test performance on large arrays (10,000 elements). You can adjust this value or use a different array size to see how the performance changes.
*   **Browser Support**: The benchmark runs on Chrome 94 and Windows desktop. You may want to consider adding support for other browsers or platforms to make the benchmark more comprehensive.

**Alternatives**

If you're looking for alternatives to MeasureThat.net, you might consider:

*   **Benchmark.js**: A popular JavaScript benchmarking library that provides a simple way to write and run benchmarks.
*   **Mocha**: A testing framework for Node.js that includes built-in support for running benchmarks.
*   **Jest**: A JavaScript testing framework developed by Facebook. While not primarily designed for benchmarking, Jest can be used to create benchmarks.

These tools provide more comprehensive features than MeasureThat.net, but they may require more setup and configuration.

Related benchmarks:

Large arrays spread vs push v2 (version: 0)

Comparing performance of: spread vs push

Created: 4 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):