Benchmark: Side effect: for i vs for of vs foreach fix (add multiply)

Script Preparation code:

var array = new Array(65535).fill(0);
var q = 0;

Tests:

for i
for (var i = 0; i < array.length; i++) { q = array[i] * array[i]; }
for..of
for (var i of array) { q = i * i; }
foreach
array.forEach((i) => q = i * i);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for i
for..of
foreach

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.

Let's break down the provided JSON benchmark definition and explain what is being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark is designed to measure the performance difference between three different loop constructs: traditional `for` loops with an index variable (`i`), `for...of` loops, and `array.forEach()` method.

**Loop Constructs Compared**

1. **Traditional `for` Loop**: This loop uses a manual index variable (`i`) to iterate over the array elements.
2. **`for...of` Loop**: This loop uses a more modern approach, where the loop variable is inferred by the browser and is not explicitly declared.
3. **`array.forEach()` Method**: This method is part of the Array prototype and provides a concise way to iterate over an array.

**Pros and Cons**

* **Traditional `for` Loop**:
	+ Pros: Well-understood, manual control over iteration.
	+ Cons: More verbose code, potential for index-related issues (e.g., out-of-bounds access).
* **`for...of` Loop**:
	+ Pros: Modern, concise syntax, automatic handling of array indices.
	+ Cons: Less familiar to some developers, potentially slower due to the need to infer loop variables.
* **`array.forEach()` Method**:
	+ Pros: Concise, easy to read, and well-documented.
	+ Cons: May be less efficient than traditional loops or `for...of` loops due to additional overhead.

**Library/Function Used**

In this benchmark, the `forEach()` method is used as a library function. The `forEach()` method is part of the Array prototype in JavaScript, which allows you to iterate over an array without explicitly declaring loop variables.

**Special JS Feature or Syntax (None)**

There are no special features or syntaxes being tested in this benchmark. All code snippets use standard JavaScript constructs and do not employ any advanced features like async/await, Promises, or Generators.

**Other Alternatives**

If you're interested in exploring alternative loop constructs or optimization techniques for your JavaScript applications, here are some options:

* Use `while` loops instead of `for` loops when you need more control over the iteration.
* Consider using `Array.prototype.map()` and `Array.prototype.filter()` methods for array operations.
* Explore the use of `Async/Await` and Promises for handling asynchronous code.
* Look into optimizing array operations using techniques like caching or memoization.

Keep in mind that these alternatives might not be directly applicable to this specific benchmark, but they can be useful in general JavaScript development.

Related benchmarks:

Side effect: for i vs for of vs foreach fix (add multiply) (version: 0)

Comparing performance of: for i vs for..of vs foreach

Created: 3 years ago by: Guest

Jump to the latest result

for i

for..of

foreach

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):