Benchmark: for vs foreach vs some vs for..of vs while 2

Script Preparation code:

var array = new Array(3000);

Tests:

for
for (var i = 0; i < array.length; i++) { array[i] * 2; }
foreach
array.forEach(function(i) { array[i] * 2; });
some
array.some(function(i) { array[i] * 2; });
for..of
for (var i of array) { array[i] * 2; }
while
let i=0; while(i < array.length) { array[i] * 2; i++; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for
foreach
some
for..of
while

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):

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**Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON data represents a benchmark test case that compares the performance of different loop constructs: `for`, `foreach`, `some`, `for..of`, and `while`.

**Loop Constructs Compared**

The five loop constructs being compared are:

1. **Traditional `for` loop**: This is a classic loop construct that uses an incrementing variable to iterate over an array.
2. **`foreach` loop**: This loop construct iterates over an array using a callback function for each element.
3. **`some` loop**: This loop construct returns `true` as soon as the condition is met, without iterating over the entire array.
4. **`for..of` loop**: This loop construct is similar to the traditional `for` loop but uses the `of` keyword to iterate over an array.
5. **`while` loop**: This loop construct uses a conditional statement to repeat the iteration until a certain condition is met.

**Options Compared**

The options being compared are:

* **Loop execution speed**: The benchmark measures how many iterations each loop can perform per second (ExecutionsPerSecond).
* **Device and browser variations**: The benchmark results include data from different devices (Mobile) and browsers (Chrome Mobile 88).

**Pros and Cons of Each Approach**

Here's a brief summary of the pros and cons of each approach:

1. **Traditional `for` loop**:
	* Pros: Easy to understand, efficient, and widely supported.
	* Cons: Can be cumbersome for large arrays or complex logic.
2. **`foreach` loop**:
	* Pros: Easy to use, concise, and suitable for small arrays.
	* Cons: Can lead to slower performance due to callback function overhead.
3. **`some` loop**:
	* Pros: Fast and efficient when the condition is met quickly.
	* Cons: May not be suitable for all scenarios, as it returns early without iterating over the entire array.
4. **`for..of` loop**:
	* Pros: Modern, concise, and easy to read.
	* Cons: Not supported in older browsers or devices.
5. **`while` loop**:
	* Pros: Flexible, efficient, and suitable for complex logic.
	* Cons: Can be harder to understand and maintain.

**Library Usage**

The `forEach`, `some`, and `for..of` loops use the following libraries:

1. **`forEach`**: Built-in JavaScript method that executes a callback function for each element in an array.
2. **`some`**: Built-in JavaScript method that returns `true` as soon as the condition is met, without iterating over the entire array.

**Special JS Features**

The `for..of` loop uses a special syntax called "iteration" which allows it to iterate over arrays and other iterables (like strings or maps).

**Other Alternatives**

Some alternative loop constructs that are not included in this benchmark include:

* **Array.prototype.map()**: A method that returns a new array with the result of applying a callback function to each element.
* **Array.prototype.filter()**: A method that returns a new array with only the elements for which the condition is met.

These alternatives can be used in different scenarios, but may not provide the same level of performance or flexibility as the loop constructs being compared.

Related benchmarks:

for vs foreach vs some vs for..of vs while 2 (version: 0)

Compare loop performance

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

Created: 5 years ago by: Registered User

Jump to the latest result

for

foreach

some

for..of

while

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):