Benchmark: for vs foreach vs some vs for..of v5

Script Preparation code:

var array = new Array(1000);
var a = ''

Tests:

for
for (var i = 0; i < array.length; i++) { a += array[i] || ''; }
foreach
array.forEach(function(i) { a += array[i] || ''; });
some
array.some(function(i) { a += array[i] || ''; });
for..of
for (var i of array) { a += array[i] || ''; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
foreach
some
for..of

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36

Browser/OS: Chrome 92 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
for	3643.6 Ops/sec
foreach	544001.6 Ops/sec
some	534489.6 Ops/sec
for..of	4348.2 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark, titled "for vs foreach vs some vs for..of v5", compares the performance of four different loop constructs in JavaScript:

1. Traditional `for` loop
2. `forEach` method (a part of the ECMAScript standard)
3. `some` method (a part of the ECMAScript standard, used with arrays)
4. Newer `for...of` loop syntax (introduced in ECMAScript 2015)

**Options Compared**

The benchmark compares the performance of each loop construct on a large array of size 1000, incrementing and concatenating values to a string (`a`) using different methods.

**Pros and Cons of Each Approach:**

1. **Traditional `for` Loop:**
	* Pros: Simple, widely supported, easy to understand.
	* Cons: Can be slow due to the overhead of index calculations and array lookups.
2. **`forEach` Method:**
	* Pros: Fast, efficient, and well-supported in modern browsers.
	* Cons: May not be as intuitive for developers familiar with traditional loops.
3. **`some` Method:**
	* Pros: Fast, efficient, and suitable for arrays with a specific condition (e.g., checking if any element meets a certain criteria).
	* Cons: Limited use cases compared to `forEach`.
4. **Newer `for...of` Loop Syntax:**
	* Pros: Efficient, easy to read, and concise.
	* Cons: May require updates to existing codebases or understanding of the new syntax.

**Library and Special JS Features Used**

In this benchmark, the following libraries or features are used:

1. **None**: This benchmark doesn't use any external libraries beyond the standard JavaScript language.
2. **Special JS Feature/Syntax:** The newer `for...of` loop syntax is highlighted in the code examples, but it's not an inherently special feature of JavaScript; rather, a new way to write traditional loops.

**Test Case Considerations**

The test cases seem to be designed to cover common use cases:

* `forEach`: A direct comparison with traditional looping.
* `some`: Testing with arrays where a specific condition is applied (although it's a relatively rare scenario).
* Traditional `for` Loop and `for...of` Loop: Comparing the performance of these two constructs, which are fundamental to JavaScript programming.

**Other Alternatives**

For those interested in alternative loop constructs or methods:

1. **Traditional for loops**: Can be slower due to overhead but provides more control over iteration.
2. **Arrow functions**: While not a traditional looping construct, arrow functions can simplify certain cases and may provide performance benefits.
3. **Recursion**: Used in some iterative algorithms, recursion can offer alternative approaches but often requires careful consideration of performance.

Keep in mind that the choice of loop construct or method ultimately depends on the specific use case and performance requirements of your application.

If you'd like to explore more benchmarking or performance optimization techniques for JavaScript, feel free to ask!

Related benchmarks:

for vs foreach vs some vs for..of v5 (version: 0)

Compare loop performance

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

Created: 3 years ago by: Guest

Jump to the latest result

for

foreach

some

for..of

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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