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

Script Preparation code:

var array = new Array(100000000);

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]; }

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:

No previous run results

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

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: 4 years ago by: Registered User

Jump to the latest result

for

foreach

some

for..of

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):