Benchmark: for vs foreach vs some vs for..of vs jQuery.each()

HTML Preparation code:

<script src="https://code.jquery.com/jquery-1.10.2.js"></script>

Script Preparation code:

var array = new Array(100);

Tests:

for
for (var i = 0; i < array.length; i++) { array[i]; }
foreach
array.forEach(function(i) { array[i]; });
some
array.some(function(i) { array[i]; });
for..of
for (var i of array) { array[i]; }
jQuery.each()
jQuery.each(array, function(index, id) { return index; });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
foreach
some
for..of
jQuery.each()

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what each test case is testing, along with their pros and cons.

**Benchmark Overview**

The benchmark compares the performance of four different loop constructs in JavaScript:

1. Traditional `for` loop
2. `forEach` method
3. `some` method
4. `for...of` loop

**Test Case 1: Traditional `for` Loop**

* **Script Preparation Code**: Creates an array of 100 elements.
* **Benchmark Definition**: `for (var i = 0; i < array.length; i++) {\r\n  array[i];\r\n}`
* **Purpose**: Tests the performance of a traditional `for` loop, which is a basic and widely used construct.

Pros:

* Simple to understand and implement.
* Well-supported by most browsers.

Cons:

* Can be slow for large arrays due to the overhead of incrementing the loop variable.

**Test Case 2: `forEach` Method**

* **Script Preparation Code**: Creates an array of 100 elements.
* **Benchmark Definition**: `array.forEach(function(i) {\r\n  array[i];\r\n});`
* **Purpose**: Tests the performance of the `forEach` method, which is a modern and efficient way to iterate over arrays.

Pros:

* Fast and efficient for large arrays.
* Supports callback functions.

Cons:

* Not supported in older browsers or with limited JavaScript engines.

**Test Case 3: `some` Method**

* **Script Preparation Code**: Creates an array of 100 elements.
* **Benchmark Definition**: `array.some(function(i) {\r\n  array[i];\r\n});`
* **Purpose**: Tests the performance of the `some` method, which returns a boolean value indicating whether at least one element in the array meets the specified condition.

Pros:

* Fast and efficient for large arrays.
* Returns a boolean value instead of iterating over the entire array.

Cons:

* Not designed for iteration; it's primarily used for conditional checks.

**Test Case 4: `for...of` Loop**

* **Script Preparation Code**: Creates an array of 100 elements.
* **Benchmark Definition**: `for (var i of array) {\r\n  array[i];\r\n}`
* **Purpose**: Tests the performance of the `for...of` loop, which is a modern and concise way to iterate over arrays.

Pros:

* Fast and efficient for large arrays.
* Concise syntax.

Cons:

* Not supported in older browsers or with limited JavaScript engines.

**Test Case 5: `jQuery.each()` Method**

* **Script Preparation Code**: Includes the jQuery library.
* **Benchmark Definition**: `jQuery.each(array, function(index, id) {\r\n  return index;\r\n});`
* **Purpose**: Tests the performance of the `jQuery.each()` method, which is a utility function for iterating over arrays.

Pros:

* Fast and efficient for large arrays.
* Supports callback functions.

Cons:

* Requires jQuery library inclusion.
* Not supported in older browsers or with limited JavaScript engines.

**Other Alternatives**

Besides these five test cases, other loop constructs like `while` loops or recursive functions are not included in the benchmark. However, it's worth noting that these alternatives may have different performance characteristics and use cases.

In general, when choosing a loop construct for your JavaScript code, consider factors such as:

* Performance: How fast does the loop need to execute?
* Code readability: How concise and readable is the loop syntax?
* Browser support: What browsers do you need to support?
* Library inclusion: Are any external libraries required?

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:66.0) Gecko/20100101 Firefox/66.0

Browser/OS: Firefox 66 on Windows

View result in a separate tab

Test name	Executions per second
for	1436758.4 Ops/sec
foreach	10361885.0 Ops/sec
some	10293212.0 Ops/sec
for..of	136270.1 Ops/sec
jQuery.each()	7019190.5 Ops/sec

Related benchmarks:

for vs foreach vs some vs for..of vs jQuery.each() (version: 0)

Compare loop performance

Comparing performance of: for vs foreach vs some vs for..of vs jQuery.each()

Created: 6 years ago by: Guest

Jump to the latest result

for

foreach

some

for..of

jQuery.each()

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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