Benchmark: for vs foreach vs some vs for..of(100,000,000)

Script Preparation code:

var array = new Array(100000000);

AخA
 
var array = new Array(100000000);

Tests:

for

for (var i = 0; i < array.length; i++) {
  array[i];
}

 
for (var i = 0; i < array.length; i++) {  array[i];}

foreach
array.forEach(function(i) { array[i]; });
array.forEach(function(i) {
array[i];
});
some
array.some(function(i) { array[i]; });
array.some(function(i) {
array[i];
});
for..of
for (var i of array) { array[i]; }
for (var i of array) {
array[i];
}

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Experimental features:

Memory measurements supported only in Chrome.
For precise memory measurements Chrome must be launched with --enable-precise-memory-info flag.
More information: Monitoring JavaScript Memory

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 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36

Browser/OS: Chrome 96 on Windows

View result in a separate tab

Test name	Executions per second
for	0.0 Ops/sec
foreach	0.6 Ops/sec
some	0.6 Ops/sec
for..of	0.1 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

I'd be happy to explain what's being tested in the provided benchmark.

Benchmark Overview

The benchmark compares the performance of four different loop constructs:

Traditional for loop
forEach loop (array method)
some loop (array method, used for checking if at least one element matches a condition)
for...of loop (new loop construct introduced in ECMAScript 2015)

Loop Constructs and Their Options

Here's an explanation of each loop construct and the options being compared:

Traditional for loop: The traditional for loop uses an index variable, starting value, and ending value to iterate over an array. In this benchmark, the loop iterates from 0 to the length of the array.
- Pros: Wide compatibility with older browsers, easy to understand for beginners.
- Cons: Can be slower due to the overhead of incrementing and decrementing index variables.
forEach loop: The forEach loop is an array method that iterates over an array using a callback function. In this benchmark, the loop uses an arrow function to iterate over the array.
- Pros: Faster execution compared to traditional for loops, as it avoids incrementing and decrementing index variables.
- Cons: Requires modern browsers or JavaScript engines to support the forEach method.
some loop: The some loop is an array method that checks if at least one element in the array matches a condition using a callback function. In this benchmark, the loop uses an arrow function to iterate over the array and check if each element matches the condition.
- Pros: Fast execution compared to traditional for loops, as it avoids incrementing and decrementing index variables.
- Cons: Requires modern browsers or JavaScript engines to support the some method.
for...of loop: The for...of loop is a new loop construct introduced in ECMAScript 2015 that allows iterating over arrays using a simple iteration syntax.
- Pros: Faster execution compared to traditional for loops, as it avoids incrementing and decrementing index variables.
- Cons: Requires modern browsers or JavaScript engines to support the for...of loop.

Other Considerations

The benchmark also considers the following factors:

Browser: The benchmark is run in a Chrome browser on a Windows Desktop.
Device Platform: The benchmark is run on a desktop device, which may affect performance compared to mobile devices or laptops.
Operating System: The benchmark is run on Windows, which may affect performance compared to other operating systems.

Library and Special Features

The some loop uses the Array.prototype.some() method, which is a built-in JavaScript library function. No special features or syntax are used in this benchmark.

Alternatives

Other alternatives for measuring loop performance could include:

Using a different programming language, such as Python or Java
Using a different testing framework or tool, such as JMeter or Gatling
Measuring performance using different metrics, such as execution time per millisecond or throughput per second

LLMs can make mistakes. Check important info.

I'd be happy to explain what's being tested in the provided benchmark.

**Benchmark Overview**

The benchmark compares the performance of four different loop constructs:

1. Traditional `for` loop
2. `forEach` loop (array method)
3. `some` loop (array method, used for checking if at least one element matches a condition)
4. `for...of` loop (new loop construct introduced in ECMAScript 2015)

**Loop Constructs and Their Options**

Here's an explanation of each loop construct and the options being compared:

1. **Traditional `for` loop**: The traditional `for` loop uses an index variable, starting value, and ending value to iterate over an array. In this benchmark, the loop iterates from 0 to the length of the array.
	* Pros: Wide compatibility with older browsers, easy to understand for beginners.
	* Cons: Can be slower due to the overhead of incrementing and decrementing index variables.
2. **`forEach` loop**: The `forEach` loop is an array method that iterates over an array using a callback function. In this benchmark, the loop uses an arrow function to iterate over the array.
	* Pros: Faster execution compared to traditional `for` loops, as it avoids incrementing and decrementing index variables.
	* Cons: Requires modern browsers or JavaScript engines to support the `forEach` method.
3. **`some` loop**: The `some` loop is an array method that checks if at least one element in the array matches a condition using a callback function. In this benchmark, the loop uses an arrow function to iterate over the array and check if each element matches the condition.
	* Pros: Fast execution compared to traditional `for` loops, as it avoids incrementing and decrementing index variables.
	* Cons: Requires modern browsers or JavaScript engines to support the `some` method.
4. **`for...of` loop**: The `for...of` loop is a new loop construct introduced in ECMAScript 2015 that allows iterating over arrays using a simple iteration syntax.
	* Pros: Faster execution compared to traditional `for` loops, as it avoids incrementing and decrementing index variables.
	* Cons: Requires modern browsers or JavaScript engines to support the `for...of` loop.

**Other Considerations**

The benchmark also considers the following factors:

* **Browser**: The benchmark is run in a Chrome browser on a Windows Desktop.
* **Device Platform**: The benchmark is run on a desktop device, which may affect performance compared to mobile devices or laptops.
* **Operating System**: The benchmark is run on Windows, which may affect performance compared to other operating systems.

**Library and Special Features**

The `some` loop uses the `Array.prototype.some()` method, which is a built-in JavaScript library function. No special features or syntax are used in this benchmark.

**Alternatives**

Other alternatives for measuring loop performance could include:

* Using a different programming language, such as Python or Java
* Using a different testing framework or tool, such as JMeter or Gatling
* Measuring performance using different metrics, such as execution time per millisecond or throughput per second

Related benchmarks:

for vs foreach vs some vs for..of(100,000,000) (version: 1)

Compare loop performance

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

Created: 3 years ago by: Registered User

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 6 months ago):