Benchmark: Loop vs Stringify Array Comparison

Script Preparation code:

window.fdeq = function equal(a, b) {
    if (a.length !== b.length) return false;
    for (let i = 0; i < a.length; i++) {
        if (a[i] !== b[i]) return false;
    }
    return true;
};

window.foo = Array.from({length: 40}, () => ([Math.random() * 40, Math.random() * 40]));
window.foo2 = JSON.parse(JSON.stringify(window.foo.slice()));
window.fox = JSON.parse(JSON.stringify(window.foo.slice(0, 30))).concat(Array.from({length: 10}, () => ([Math.random() * 40, Math.random() * 40])));
window.bar = Array.from({length: 40}, () => ([Math.random() * 40, Math.random() * 40]));

Tests:

loop same
fdeq(window.foo, window.foo2);
loop similar
fdeq(window.foo, window.fox);
loop different
fdeq(window.foo, window.bar);
stringify same
JSON.stringify(window.foo) === JSON.stringify(window.foo2)
stringify similar
JSON.stringify(window.foo) === JSON.stringify(window.fox)
stringify different
JSON.stringify(window.foo) === JSON.stringify(window.bar)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
loop same
loop similar
loop different
stringify same
stringify similar
stringify different

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser/OS: Chrome 137 on Windows

View result in a separate tab

Test name	Executions per second
loop same	62025540.0 Ops/sec
loop similar	60623820.0 Ops/sec
loop different	59956896.0 Ops/sec
stringify same	41219.7 Ops/sec
stringify similar	41266.3 Ops/sec
stringify different	41102.8 Ops/sec

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

LLMs can make mistakes. Check important info.

**What is being tested?**

The provided benchmark tests the performance of two approaches to compare arrays in JavaScript: using loops and stringifying arrays.

The test cases are designed to simulate different scenarios:

1. **Loop vs Stringify Array Comparison**: This is the main benchmark, which compares the execution time of two functions:
	* `fdeq(window.foo, window.foo2)`: A custom implementation that uses a loop to compare two arrays.
	* `JSON.stringify(window.foo) === JSON.stringify(window.foo2)`: The built-in `JSON.stringify()` function is used to convert arrays to strings for comparison.
2. **Loop Similar**: This test case compares the execution time of two loops that are similar in structure but have different implementations:
	* `fdeq(window.foo, window.fox)`: A custom implementation that uses a loop to compare two arrays, where the second array is created by concatenating and shuffling another array.
3. **Loop Different**: This test case compares the execution time of two loops with different approaches:
	* `fdeq(window.foo, window.bar)`: A custom implementation that uses a loop to compare two arrays.
4. **Stringify Same**, **Stringify Similar**, and **Stringify Different**: These test cases measure the execution time of stringifying arrays using `JSON.stringify()` with different input arrays.

**Options compared**

The benchmark compares the following options:

* Using loops vs stringifying arrays
* Custom implementation vs built-in `JSON.stringify()`
* Similar loop structures vs different loop approaches

**Pros and Cons**

Here are some pros and cons for each approach:

1. **Loop**:
	+ Pros: Can be faster for small to medium-sized arrays, more control over comparison logic.
	+ Cons: Can be slower for large arrays due to the overhead of iteration, may not handle edge cases correctly.
2. **Stringify Array Comparison** (using `JSON.stringify()`):
	+ Pros: Faster for large arrays, handles edge cases automatically, widely supported.
	+ Cons: May lose precision when dealing with floating-point numbers, can be slower for small arrays.

**Other Considerations**

* The custom implementation (`fdeq()`) is likely optimized for performance and may not handle all edge cases correctly.
* The built-in `JSON.stringify()` function is widely supported but may not perform well on very large arrays or arrays with many properties.

**Alternative Approaches**

Other approaches to compare arrays in JavaScript include:

1. **Using `Array.prototype.every()`**: This method can be used to compare two arrays element-wise and returns a boolean indicating whether all elements are equal.
2. **Using `Array.prototype.reduce()`**: This method can be used to compare two arrays element-wise and accumulates a result value.

These alternative approaches may have different performance characteristics than the loop-based implementation or stringifying arrays approach.

In summary, the benchmark tests the performance of different approaches to compare arrays in JavaScript, including custom implementations and built-in functions like `JSON.stringify()`. The results can help developers choose the most efficient approach for their specific use cases.

Related benchmarks:

Loop vs Stringify Array Comparison (version: 0)

Comparing performance of: loop same vs loop similar vs loop different vs stringify same vs stringify similar vs stringify different

Created: 2 years ago by: Guest

Jump to the latest result

loop same

loop similar

loop different

stringify same

stringify similar

stringify different

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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