Benchmark: foreach vs for...of w/ enties() for uint8array

Script Preparation code:

var a = new Uint8Array(10000);


for (let i = 0; i < 10000; i++) {
    a[i] = ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c => (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16));
}

Tests:

forOf
for (const [idx, item] of a.entries()) { console.log(idx, item) }
foreach
a.forEach((item, idx) => console.log(idx, item))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
forOf
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):

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Let's break down the benchmark and its results.

**What is being tested?**

The benchmark measures the performance of two different loop constructs in JavaScript:

1. **Traditional `forEach` loop**: This loop iterates over an array using the `forEach` method, which takes a callback function as an argument.
2. **ES6 `for...of` loop with `entries()`**: This loop iterates over an array using the `for...of` statement and calls the `entries()` method on the array to get an iterator.

**Options being compared**

The benchmark is comparing two options:

* Traditional `forEach` loop
* ES6 `for...of` loop with `entries()`

**Pros and Cons of each approach:**

1. **Traditional `forEach` loop**
	* Pros:
		+ Widely supported and well-known.
		+ Easy to understand and implement for developers familiar with older JavaScript versions.
	* Cons:
		+ May be slower than modern alternatives due to the overhead of calling a callback function on each iteration.
2. **ES6 `for...of` loop with `entries()`
	* Pros:
		+ Faster execution compared to traditional `forEach`, as it avoids the overhead of callback functions.
		+ More efficient memory usage, as it only iterates over the array once without storing intermediate results in memory.
	* Cons:
		+ Less widely supported and may require additional setup for developers unfamiliar with newer JavaScript features.

**Library used**

The benchmark uses the `crypto` library to generate random values, which is a built-in Node.js module. Its purpose is to provide a cryptographically secure way to generate random numbers.

**Special JS feature or syntax**

The benchmark uses ES6 syntax for the `for...of` loop with `entries()`, specifically:

* The `const [idx, item] = a.entries()` syntax, which is an example of array destructuring.
* The `(c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4)` expression, which generates a random value using the `crypto` library.

**Other alternatives**

If you want to compare other loop constructs or optimize your JavaScript code further, consider exploring:

* Other iteration methods, such as `for` loops with indexing variables or `Array.prototype.forEach.call()`
* Modern alternative loop constructs, like `while` loops or `do...while` loops
* Optimizations specific to your use case, such as reducing the number of array lookups or reusing intermediate results.

Keep in mind that performance optimizations often depend on the specifics of your code and target audience.

Related benchmarks:

foreach vs for...of w/ enties() for uint8array (version: 0)

Compare loop performance

Comparing performance of: forOf vs foreach

Created: 2 years ago by: Guest

Jump to the latest result

forOf

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):