Benchmark: Traditional vs For Each Loop

Script Preparation code:

var arr = Array.from({
    length: 100000000
}).fill(1);

Tests:

For Loop
for (let i = 0; i < arr.length; i++) { let j = arr[i] + i; }
For Each
arr.forEach((val, index)=>{ let k = index+val })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
For Loop
For Each

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the benchmark and explain what's being tested, compared, and considered.

**Benchmark Overview**

The benchmark is designed to compare two approaches for iterating over an array: traditional `for` loops versus `forEach` loops with arrow functions.

**Script Preparation Code**

The script preparation code creates a large array of 100 million elements filled with the value `1`. This is done using JavaScript's `Array.from()` method, which takes an object with a `length` property and returns a new array populated with `fill(1)` values. The resulting array is stored in the `arr` variable.

**Html Preparation Code**

There is no HTML preparation code provided, so we'll assume that the benchmark only involves JavaScript execution and doesn't account for DOM-related overhead.

**Individual Test Cases**

There are two individual test cases:

1. **For Loop**: This test case uses a traditional `for` loop with a manual increment (`i`) to iterate over the array. The loop body calculates `j = arr[i] + i`.
2. **For Each**: This test case uses an arrow function with `forEach()` to iterate over the array. The lambda expression `(val, index) => { ... }` is used to process each element.

**Library and Special JS Features**

In this benchmark, no external libraries are used. However, if any of these tests were modified or updated in the future, they might depend on a specific version of JavaScript features such as `arrow functions` (introduced in ECMAScript 2015) or `template literals` (also introduced in ECMAScript 2015).

**Pros and Cons**

Here are some pros and cons associated with each approach:

* **Traditional For Loop**: Pros:
	+ Easy to understand and implement for developers familiar with traditional loops.
	+ Can be optimized for specific use cases, such as iterating over an array of objects.
*   Cons: Can lead to performance issues if not properly looped or have less efficient algorithmic logic
* **For Each with Arrow Functions**: Pros:
	+ More concise and readable than traditional `for` loops for simple iteration patterns.
	+ Reduces boilerplate code, as the lambda expression is automatically bound to the element's index.
*   Cons: May be slower due to additional overhead from the arrow function syntax.

Related benchmarks:

Traditional vs For Each Loop (version: 0)

For Each Loop

Comparing performance of: For Loop vs For Each

Created: 2 years ago by: Guest

Jump to the latest result

For Loop

For Each

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):