Benchmark: Test Demo 1 - MeasureThat.net

Tests:

ForEach
const v = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]; let t1 = 0; v.forEach(x => { if (!x%2) t1++; });
Filter
const v = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]; let t2 = v.filter(x => !x%2).length;
For
const v = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]; let t3 = 0; for (i=0; i<v.length; i++) { if (!v[i]%2) t3++; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
ForEach
Filter
For

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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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 definitions and options.

**Benchmark Options:**

The three individual test cases, "ForEach", "Filter", and "For", are designed to measure the performance of different approaches for iterating over an array of numbers in JavaScript. Each test case has a distinct way of achieving this goal:

1.  **ForEach:** Uses the `forEach` method, which executes a provided callback function once for each element in an array.
2.  **Filter:** Utilizes the `filter` method, which constructs a new array from elements that pass the test implemented by a provided function.
3.  **For:** Employs a traditional `for` loop to iterate over the array.

**Options Comparison:**

Here's a brief analysis of each approach along with their pros and cons:

*   **ForEach:**
    *   Pros:
        *   Simplified code
        *   Easy to understand and maintain
    *   Cons:
        *   May incur overhead due to callback function invocation
*   **Filter:**
    *   Pros:
        *   Concise syntax
        *   Expressive (easy to read)
*   **For:**
    *   Pros:
        *   Low-level control and flexibility
        *   Performance-oriented (avoiding JavaScript engine optimizations)
*   **Library Consideration:** None

**Other Alternatives:**

In addition to the mentioned methods, other approaches could be used for iterating over arrays in JavaScript:

*   `map()`: Like `filter`, but it creates a new array with results of applying a provided function on every element.
*   `reduce()`: Used to apply a reduction function against an accumulator and each element in the array (from left to right) to reduce it to a single value.

**Additional Notes:**

The test cases do not explicitly mention any special JavaScript features or syntax, such as async/await, Promises, or modern ES6+ features. However, some benchmarking libraries may use these features under the hood for performance optimizations.

To further improve understanding of these benchmarks and their respective performances, running them with different versions of a JavaScript engine, browsers, or even Node.js could provide valuable insights into performance variations and library-specific behaviors.

Related benchmarks:

Test Demo 1 (version: 0)

Comparing performance of: ForEach vs Filter vs For

Created: 5 years ago by: Guest

Jump to the latest result

ForEach

Filter

For

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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