Benchmark: for+if vs filter

Script Preparation code:

var items = [0,1,2,3,4,5,6,7,8,9]

Tests:

for-loop
for(var i = 0; i < items.length; i++) { if(items[i] === 6) break; } items[i]
filter
items.filter(item => item === 6);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for-loop
filter

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 14_7_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.1.2 Mobile/15E148 Safari/604.1

Browser/OS: Mobile Safari 14 on iOS 14.7.1

View result in a separate tab

Test name	Executions per second
for-loop	711083.8 Ops/sec
filter	5033199.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks and explore what's being tested in this specific benchmark.

**Benchmark Definition**
The benchmark definition is a JSON object that describes the test case. In this case, we have two test cases: "for-loop" and "filter". The script preparation code is provided, which defines an array `items` containing integers from 0 to 9. There is no HTML preparation code, so it's assumed that the benchmark only cares about the JavaScript execution.

**What's being tested?**
The benchmark tests two approaches for achieving a similar result:

1. **For-loop**: This approach uses a traditional `for` loop to iterate through the array and check if each element is equal to 6. If it is, the loop breaks. Finally, the value of `i` is returned.
2. **Filter**: This approach uses the `Array.prototype.filter()` method to create a new array that only includes elements for which the predicate function returns `true`. In this case, the predicate function checks if each element is equal to 6.

**Options compared**
The benchmark compares two options:

* Traditional `for` loop (test case: "for-loop")
* Filter approach (test case: "filter")

These two approaches have different pros and cons:

* **For-loop**:
	+ Pros:
		- Easy to understand and implement
		- Can be optimized for specific use cases
	+ Cons:
		- Can be slower due to the overhead of loop management
		- May not be as efficient for large datasets
* **Filter approach**:
	+ Pros:
		- More concise and expressive
		- Can be faster for large datasets, as it avoids unnecessary iterations
	+ Cons:
		- May require more setup time due to the need to define a predicate function
		- Can be less readable for complex predicates

**Library used**
In this benchmark, the `Array.prototype.filter()` method is used, which is a built-in JavaScript library. This library provides an efficient way to create new arrays based on a set of conditions.

**Special JS feature/syntax**
There are no special JavaScript features or syntax used in these test cases. The benchmark focuses solely on the performance comparison between two different approaches.

**Other alternatives**
In general, there are other ways to achieve similar results as the filter approach, such as:

* Using `Array.prototype.map()` and `Array.prototype.some()`
* Implementing a custom loop using `while` or recursion
* Utilizing more advanced JavaScript features like `let` or `const` with closures

However, these alternatives may not be as concise or efficient as the filter approach.

**Benchmark preparation code**
To run this benchmark, you would need to copy the script preparation code into a JavaScript file and execute it using a tool like MeasureThat.net. The benchmark will then compare the execution times of the two test cases.

I hope this explanation helps! Let me know if you have any further questions.

Related benchmarks:

for+if vs filter (version: 0)

Comparing performance of: for-loop vs filter

Created: 3 years ago by: Guest

Jump to the latest result

for-loop

filter

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):