Benchmark: loop/filter test

Script Preparation code:

var array = ['aa','ab','ac','sd','df'];
var result = [];

Tests:

simple loop
for (let index = 0; index < array.length; index++) { const element = array[index]; if(element.startsWith('a')){ result.push(element); } }
filter
result = array.filter(e=> e.startsWith('a'));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
simple loop
filter

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definitions and explain what's being tested, compared, and their pros and cons.

**Benchmark Definition**

The website `MeasureThat.net` allows users to create JavaScript microbenchmarks. The provided benchmark definition is in JSON format, which consists of two main parts:

*   **Script Preparation Code**: This code sets up the initial state for the benchmark test. In this case, it creates a string array `array` and an empty result array `result`.
*   **Html Preparation Code**: This section is left blank, indicating that no HTML preparation code is needed for this benchmark.

**Individual Test Cases**

There are two individual test cases:

1.  **"simple loop"**: This test case uses a traditional JavaScript `for` loop to iterate over the `array` and push elements that start with 'a' into the `result` array.
2.  **"filter"**: This test case utilizes the built-in `Array.prototype.filter()` method to achieve the same result as the "simple loop". The filter callback function checks if an element starts with 'a'.

**Comparison of Looping Approaches**

The two test cases demonstrate different approaches for achieving the same result:

1.  **Traditional Looping (`"simple loop"`)**: This approach uses a `for` loop to iterate over the array and manually checks each element.
2.  **Array.prototype.filter() (`"filter"`)**: The filter method provides a concise way to create a new array with elements that meet the condition.

**Pros and Cons of Each Approach**

*   **Traditional Looping (`"simple loop"`)**:
    *   Pros: More control over the iteration process, easier to understand for those familiar with traditional looping.
    *   Cons: Can be slower due to manual checks, more verbose code.
*   **Array.prototype.filter() (`"filter"`)**
    *   Pros: Faster execution, concise and readable code, leverages built-in functionality.
    *   Cons: May require a basic understanding of the filter method.

**Library: Array.prototype.filter()**

The `Array.prototype.filter()` method is a built-in JavaScript library that provides an efficient way to create new arrays with elements that meet specific conditions. It's often used in modern JavaScript development for its conciseness and performance.

**Special JS Feature/Syntax (if applicable)**

In this case, the filter method uses a feature called "arrow functions" (`e=> e.startsWith('a')`), which is a concise way to define small functions without the need for function declarations. Arrow functions are a modern JavaScript syntax introduced in ECMAScript 2015.

**Other Alternatives**

If you prefer other looping approaches, here are some alternatives:

*   **forEach()**: The `Array.prototype.forEach()` method allows iterating over an array while performing actions on each element.
*   **map()**: The `Array.prototype.map()` method creates a new array with the results of applying a provided function to each element in the original array.
*   **Reduce()**: The `Array.prototype.reduce()` method applies a function against an accumulator and each element in the array (from left to right) to reduce it to a single output value.

Related benchmarks:

loop/filter test (version: 0)

Comparing performance of: simple loop vs filter

Created: 3 years ago by: Guest

Jump to the latest result

simple loop

filter

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):