Benchmark: for vs foreach vs some vs for..of v2

Script Preparation code:

var array = new Array(100);

Tests:

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

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_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36

Browser/OS: Chrome 90 on Mac OS X 10.15.6

View result in a separate tab

Test name	Executions per second
for	80661.3 Ops/sec
foreach	3842171.8 Ops/sec
some	3795859.5 Ops/sec
for..of	125795.2 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided benchmark compares the performance of four different loop iteration methods: `for`, `foreach`, `some`, and `for..of`. The test is designed to measure which method provides the fastest execution time on a JavaScript engine.

**Loop Iteration Methods Compared**

1. **`for`**: This traditional loop uses an explicit index variable (`i`) to iterate over the array.
2. **`foreach`**: This loop uses the `forEach()` method, which executes a callback function for each element in the array.
3. **`some`**: This loop uses the `some()` method, which returns `true` as soon as the callback function returns `true`.
4. **`for..of`**: This modern loop uses the `for...of` loop syntax, which is designed to iterate over iterable objects like arrays.

**Pros and Cons of Each Approach**

1. **`for`**:
	* Pros: Well-established, easy to understand, and suitable for simple iterations.
	* Cons: Can be verbose, especially when dealing with complex logic or large arrays.
2. **`foreach`**:
	* Pros: Concise and readable syntax, can handle callbacks efficiently.
	* Cons: May not be as fast as traditional loops due to callback function overhead.
3. **`some`**:
	* Pros: Returns early if the condition is met, reducing unnecessary iterations.
	* Cons: Can be slower than traditional loops or `foreach` loops due to method call overhead.
4. **`for..of`**:
	* Pros: Modern, concise syntax, designed for iterating over arrays and other iterable objects.
	* Cons: May require more code changes for those familiar with traditional loops.

**Library Usage**

The test case uses the `Array.prototype.forEach()` method, which is a built-in method in JavaScript. This method iterates over an array and calls a callback function for each element in the array.

**Special JS Features or Syntax**

The test case does not explicitly use any special JavaScript features or syntax beyond what is commonly used in modern JavaScript development.

**Other Alternatives**

For benchmarking JavaScript performance, other alternatives include:

* **V8 Benchmark Suite**: A collection of benchmarks designed to measure V8 engine performance.
* **jsPerf**: A popular benchmarking tool for testing JavaScript performance.
* **BenchmarkJS**: A lightweight benchmarking library for Node.js and modern browsers.

These tools can be used to compare the performance of different JavaScript engines, libraries, or frameworks.

Related benchmarks:

for vs foreach vs some vs for..of v2 (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):