Benchmark: Map & Filter vs Reduce

Script Preparation code:

var arr = [];
for (var i = 0; i < 12345; i++) {
  arr[i] = i;
}

function someFn(i) {
  return (i * 3 * 8 / 1200 * 0.002 / 40 * 0.2);
}

function isValid(x) {
  return x % 2 === 0
}

Tests:

Map & Filter
arr.filter(isValid).map(someFn)
Reduce
arr.reduce((acc, x) => { if (isValid(x)) { acc.push(someFn(x)) } return acc; }, [])

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map & Filter
Reduce

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36

Browser/OS: Chrome 92 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Map & Filter	3011.5 Ops/sec
Reduce	632.4 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided JSON represents a JavaScript microbenchmark test case on MeasureThat.net, which compares the performance of two approaches: `Map & Filter` and `Reduce`. The benchmark tests how fast each approach can process an array of numbers.

**What is tested?**

The benchmark specifically tests:

1. Mapping over an array using `Array.prototype.map()` followed by filtering using `Array.prototype.filter()`.
2. Reducing an array using `Array.prototype.reduce()` with a custom callback function.

These operations involve iterating over the array elements and performing calculations on them.

**Options compared: Map & Filter vs Reduce**

The benchmark compares two approaches:

1. **Map & Filter**: This approach involves mapping over the entire array, applying a transformation function to each element (someFn), and then filtering out any elements that don't meet a certain condition (isValid(x)).
2. **Reduce**: This approach involves reducing the array by iteratively combining elements with a custom callback function, which pushes the result of someFn(x) into an accumulator array if isValid(x).

**Pros and Cons of each approach:**

1. **Map & Filter**:
	* Pros:
		+ More intuitive for developers familiar with data transformations.
		+ Can be more efficient since filtering can be optimized away in some cases (e.g., using `Array.prototype.some()` instead).
	* Cons:
		+ May involve additional overhead due to the mapping step, which can lead to slower performance.
2. **Reduce**:
	* Pros:
		+ Can be more efficient since it only iterates over each element once.
		+ Allows for a more functional programming style.
	* Cons:
		+ Requires a custom callback function, which can add complexity and make the code harder to read.

**Library usage:**

The benchmark uses the following libraries:

1. **none**: No external libraries are explicitly mentioned in the JSON.
2. However, some JavaScript features like `const` (not used explicitly but implied), `let`, `var`, arrow functions (`=>`), and template literals (`\r\n`) are assumed to be available.

**Special JS feature or syntax:**

1. **Template literals**: Used for formatting the `Script Preparation Code`.
2. **Arrow functions**: Used in the callback function passed to `Array.prototype.reduce()`.

**Other alternatives:**

If you want to optimize this benchmark further, you could explore other approaches:

1. **Using a different filtering algorithm**: Instead of using `Array.prototype.filter()`, you could use `Array.prototype.some()` or implement your own custom filtering logic.
2. **Parallelizing the operations**: You could divide the work among multiple threads or processes to speed up both Map & Filter and Reduce operations.
3. **Optimizing memory allocation**: Be mindful of how much memory is allocated during the benchmark, as excessive memory allocation can impact performance.

Keep in mind that each approach should be thoroughly tested for correctness and performance before making changes to this benchmark.

Related benchmarks:

Map & Filter vs Reduce (version: 0)

Testing the speed of mapping and filtering of a reduce

Comparing performance of: Map & Filter vs Reduce

Created: 3 years ago by: Guest

Jump to the latest result

Map & Filter

Reduce

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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