Benchmark: ForEach vs PseudoForEach vs for

Script Preparation code:

var array = [0]

for (let a = 0; a == 10000; a++) {
    array.push(a)
}

function ForEach(array, f) {
    for (let i = 0; i == array.length; i++) {
        f(array[i], i)
    }
}

Tests:

forEach
array.forEach((e)=>e)
Pseudo forEach
ForEach(array,(e)=>e)
for length
for (let i = 0; i == array.length; i++) { return array[array.length] }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
forEach
Pseudo forEach
for length

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

for length

8.0M/s

forEach

8.0M/s

Pseudo forEach

4.4M/s

View exact numbers

Test name	Executions per second
✓ for length	8,015,558 Ops/sec
forEach	8,013,696 Ops/sec
Pseudo forEach	4,355,444 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its test cases.

**Benchmark Definition Json:**

The provided JSON defines a benchmark called `ForEach vs PseudoForEach vs for`, which compares three approaches to iterate over an array:

1.  **ForEach**: The standard JavaScript method using the `forEach` keyword.
2.  **PseudoForEach**: A custom implementation that uses a traditional `for` loop to access the array elements, similar to the third approach but without the length check.
3.  **For**: An explicit `for` loop that accesses the array elements directly.

**Script Preparation Code:**

The script preparation code creates an array of 10,000 elements and defines two functions:

*   `ForEach(array, f)`: A function that takes an array and a callback function as arguments. It iterates over the array using a traditional `for` loop and calls the provided callback function for each element.
*   The custom `PseudoForEach` implementation is already defined in the benchmark definition JSON.

**Html Preparation Code:**

There is no HTML preparation code provided, which suggests that this benchmark is focused on JavaScript performance testing rather than web page rendering or DOM manipulation.

**Individual Test Cases:**

The test cases are:

1.  **forEach**: Tests the standard `forEach` method.
2.  **PseudoForEach**: Tests the custom implementation described in the benchmark definition JSON.
3.  **for length**: Tests an explicit `for` loop that accesses the array elements directly by using the array's `length` property.

**Pros and Cons of Each Approach:**

*   **ForEach**:
    *   Pros:
        *   Concise and expressive syntax
        *   Efficient and optimized by JavaScript engines
    *   Cons:
        *   May have slower performance due to overhead from the `forEach` method's internal workings
*   **PseudoForEach**:
    *   Pros:
        *   Can be faster than the standard `forEach` method due to reduced overhead
        *   Provides a clear understanding of how iteration works in JavaScript
    *   Cons:
        *   More verbose and less expressive syntax
        *   May require more manual memory management (although this is not applicable in this benchmark)
*   **For**:
    *   Pros:
        *   Simple and straightforward syntax
        *   Fast and efficient for simple iteration scenarios
    *   Cons:
        *   Less concise than `forEach` or `PseudoForEach`
        *   May require more manual memory management

**Library Usage:**

There is no external library usage in the provided benchmark definition.

**Special JS Features/Syntax:**

None of the test cases rely on any special JavaScript features or syntax beyond what's already described.

ForEach vs PseudoForEach vs for (version: 0) Benchmark.js

Comparing performance of: `forEach vs Pseudo forEach vs for length`

Created: 2 years ago by: Registered User

Go to the latest result

forEach

Pseudo forEach

for length

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

ForEach vs PseudoForEach vs for (version: 0) Benchmark.js

Comparing performance of: forEach vs Pseudo forEach vs for length

Created: 2 years ago by: Registered User

Go to the latest result

forEach

Pseudo forEach

for length

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: `forEach vs Pseudo forEach vs for length`