Benchmark: while vs for vs forEach vs for of - 100000000 - calc exponent multiple

Script Preparation code:

var arr =new Array(100000000);

Tests:

while
let i=0; while(i < arr.length) { const exp = arr[i] ** 2 ** 2 ** 2 ** 2; i++; }
for
for(let i=0; i<arr.length; i++) { const exp = arr[i] ** 2 ** 2 ** 2 ** 2; }
forEach
arr.forEach((element) => { const exp = element ** 2 ** 2 ** 2 ** 2; });
for of
for(const element of arr) { const exp = element ** 2 ** 2 ** 2 ** 2; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
while
for
forEach
for of

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 provided benchmark and explain what is tested, the options compared, pros and cons of each approach, and other considerations.

**Benchmark Overview**

The benchmark compares four ways to iterate over an array in JavaScript: `while`, `for`, `forEach`, and `for...of`. The test case calculates the result of raising each element in the array to the power of 4 four times using exponentiation (`**`).

**Options Compared**

1. **While Loop**: Uses a traditional `while` loop to iterate over the array, incrementing an index variable until it reaches the end of the array.
2. **For Loop**: Uses a `for` loop with an explicit iteration variable to iterate over the array.
3. **forEach Method**: Uses the `Array.prototype.forEach()` method to iterate over the array, calling a callback function for each element.
4. **For...of Loop**: Uses the `for...of` loop syntax to iterate over the array.

**Pros and Cons of Each Approach**

1. **While Loop**:
	* Pros: Simple and lightweight, can be faster due to minimal overhead.
	* Cons: More error-prone, requires explicit index management, and can lead to off-by-one errors.
2. **For Loop**:
	* Pros: Fast and efficient, allows for easy iteration control, and is widely supported.
	* Cons: May require more code than necessary, and can be less readable due to the explicit variable declaration.
3. **forEach Method**:
	* Pros: Concise and readable, eliminates the need for an explicit index variable, and is designed for iteration over arrays.
	* Cons: May incur additional overhead compared to traditional loops, and can lead to slower performance in some cases.
4. **For...of Loop**:
	* Pros: Modern, concise, and easy to read, with minimal overhead and good performance characteristics.
	* Cons: May not be supported in older browsers or environments.

**Library and Special Features**

None mentioned in the provided benchmark definition.

**Other Considerations**

1. **Performance**: The order of operations can significantly impact performance. In this case, `for...of` appears to outperform all other options.
2. **Readability**: The choice of iteration method affects code readability and maintainability. `forEach` is often a good default due to its concise nature, while traditional loops may require more boilerplate code.
3. **Compatibility**: The benchmark should be executed in multiple browsers and environments to ensure compatibility with different JavaScript engines.

**Alternatives**

Other alternatives for iterating over arrays include:

1. `map()`, `filter()`, or `reduce()` methods, which can transform or aggregate array elements in a more functional programming style.
2. `Array.prototype.entries()` method, which returns an iterator that yields [index, value] pairs.
3. Custom iterators using `Iterator protocol` (ES6+), which allows for more fine-grained control over iteration.

Keep in mind that the choice of iteration method depends on the specific use case and personal preference.

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Comparing performance of: while vs for vs forEach vs for of

Created: 4 years ago by: Guest

Jump to the latest result

while

for

forEach

for of

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):