Benchmark: foreach filter vs foreach conditional

Script Preparation code:

var arr = [];
for (var i = 0; i < 12345; i++) {
  arr[i] = i;
}

var arr2 = [];
for (var i = 0; i < 12345; i++) {
  arr2[i] = i;
}


var testObj;

Tests:

forEach
arr.forEach( (flowConnectionReference) => { if (flowConnectionReference !== 1) { testObj = { "test": flowConnectionReference } } });
filter
arr2.filter((flowConnectionReference) => flowConnectionReference !== 1) .forEach(flowConnectionReference => { testObj = {"test": flowConnectionReference}});

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
forEach
filter

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.101 Safari/537.36

Browser/OS: Chrome 91 on Windows

View result in a separate tab

Test name	Executions per second
forEach	547.4 Ops/sec
filter	388.9 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what is being tested.

**Benchmark Overview**

The benchmark compares the performance of two approaches: `forEach` with a conditional statement, and `filter` followed by `forEach`. The test case creates an array `arr` and another identical array `arr2`, and then runs each approach on these arrays.

**Options Compared**

There are two options being compared:

1. **`forEach` with a conditional statement**: This approach uses the `forEach` method to iterate over the array, and inside the callback function, it checks if the current element is not equal to 1. If it's not, it assigns an object with the test value to a variable `testObj`.
2. **`filter` followed by `forEach`**: This approach uses the `filter` method to create a new array with elements that don't match the condition (in this case, 1), and then uses `forEach` on this filtered array to iterate over it and assign an object to `testObj`.

**Pros and Cons**

Here are some pros and cons of each approach:

**`forEach` with a conditional statement**

Pros:

* Simple and straightforward implementation
* Easy to understand and maintain

Cons:

* May be slower due to the overhead of checking the condition inside the callback function
* Can be less efficient if the array is large, as it may require more iterations

**`filter` followed by `forEach`**

Pros:

* Can be more efficient for large arrays, as filtering reduces the number of elements that need to be processed
* Can be faster due to the fact that filtering is typically implemented in native code, which can be optimized for performance

Cons:

* More complex implementation compared to the first approach
* May have a higher overhead due to the creation of an intermediate array and the use of additional methods

**Other Considerations**

The benchmark also includes the device platform (Desktop), operating system (Windows), and browser (Chrome 91) information, which can provide valuable insights into how different environments affect the performance of these approaches.

**Libraries and Special JS Features**

In this case, there are no libraries being used, but we should note that some JavaScript engines or browsers may optimize certain methods or features in a way that affects the outcome of this benchmark. There are also no special JavaScript features (like `async/await`, `let`/`const` hoisting, etc.) mentioned in the provided code.

**Alternatives**

Other alternatives to consider for similar benchmarks might include:

* Using other array methods like `map()` or `reduce()`
* Comparing the performance of different data structures (e.g., arrays vs. objects)
* Investigating how different optimization techniques or browser-specific features affect the performance of these approaches
* Creating a more complex benchmark with multiple iterations, conditional statements, and loops to simulate real-world scenarios.

Keep in mind that the specific alternatives will depend on the goals and scope of the benchmark.

Related benchmarks:

foreach filter vs foreach conditional (version: 0)

Comparing performance of: forEach vs filter

Created: 3 years ago by: Guest

Jump to the latest result

forEach

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):