Benchmark: JS compare array

Script Preparation code:

window.foo = ['cat', 'dog', 'bird'];
window.bar = ['cat', 'dog', 'bird'];

window.strcompare = (a, b) =>
  a.join() === b.join();

window.equals = (a, b) =>
  a.length === b.length &&
  a.every((v, i) => v === b[i]);

Tests:

equals
window.equals(window.foo, window.bar)
strcompare
window.strcompare(window.foo, window.bar)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
equals
strcompare

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Windows

View result in a separate tab

equals

4.5M/s

strcompare

2.1M/s

View exact numbers

Test name	Executions per second
✓ equals	4,453,282 Ops/sec
strcompare	2,085,444 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 world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition JSON**

The provided JSON represents a benchmark for comparing two arrays, `window.foo` and `window.bar`, using two different approaches: `window.equals` and `window.strcompare`.

*   **Script Preparation Code**: This code defines two global variables, `foo` and `bar`, each containing an array of strings. These arrays are used as inputs for the benchmark tests.
*   **Html Preparation Code**: Since this is a JavaScript-only benchmark, there's no HTML preparation code provided.
*   **Benchmark Definition**: The benchmark consists of two test cases:
    *   `window.equals(window.foo, window.bar)`: This test case compares the arrays using the `window.equals` function. The purpose of this function is to check if both arrays have the same length and contain identical elements in the same order.
    *   `window.strcompare(window.foo, window.bar)`: This test case compares the arrays using the `window.strcompare` function. The purpose of this function is to compare the arrays by joining their elements into strings and then checking if these strings are equal.

**Comparison of Approaches**

Let's analyze the pros and cons of each approach:

*   **`window.equals`**:
    *   **Pros**: This approach checks for both length equality and element-wise equality, which can be beneficial when working with arrays of different lengths.
    *   **Cons**: It can be slower due to the additional check for length equality.
*   **`window.strcompare`**:
    *   **Pros**: This approach is simpler and faster since it only checks if two joined strings are equal. However, it may not work correctly for arrays of different lengths or when elements have different string representations.
    *   **Cons**: It can be less accurate when comparing arrays of different lengths.

**Library: `window.equals`**

The `window.equals` function is likely a custom implementation that provides an efficient way to compare two arrays. Without more information, we can only speculate about its implementation details.

**Special JS Feature/Syntax (None)**

There's no special JavaScript feature or syntax used in the benchmark.

**Alternatives**

If you're interested in exploring alternative approaches for array comparison, consider the following:

*   **`Array.prototype.every()` and `Array.prototype.some()`**: Instead of creating a custom `equals` function, you can use these built-in methods to compare arrays.
*   **`lodash.equals()` or other utility libraries**: If you need more advanced array comparison functionality, you might consider using an existing library like Lodash.

In summary, the MeasureThat.net benchmark compares two arrays using two different approaches: `window.equals` and `window.strcompare`. The choice of approach depends on your specific use case and performance requirements.

JS compare array (version: 1) Benchmark.js

equals vs string join

Comparing performance of: `equals vs strcompare`

Created: 2 years ago by: Registered User

Go to the latest result

equals

strcompare

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

JS compare array (version: 1) Benchmark.js

equals vs string join

Comparing performance of: equals vs strcompare

Created: 2 years ago by: Registered User

Go to the latest result

equals

strcompare

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

Related benchmarks

Comparing performance of: `equals vs strcompare`