Benchmark: for vs foreach vs some vs for..of vs for..in-jer

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]; }
for..in
for (var i in array) { i; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**Benchmark Definition**

The provided JSON represents a benchmarking test that compares the performance of different loop constructs in JavaScript:

1. `for` loops
2. `forEach` method
3. `some` method
4. `for...of` loops
5. `for...in` loops

These loop types are commonly used in JavaScript programming, and their performance can vary depending on the specific use case.

**Loop Options Compared**

Here's a brief overview of each loop type:

1. **`for` loops**: These loops use an explicit counter variable (`i`) to iterate over an array or other iterable. The loop continues as long as the condition is true.
	* Pros: Simple and intuitive, can be used with any type of data.
	* Cons: Can lead to bugs if not used carefully (e.g., off-by-one errors).
2. **`forEach` method**: This method iterates over an array or other iterable, calling a callback function for each element.
	* Pros: Concise and easy to read, can be used with arrays or other iterables.
	* Cons: Can be slower than traditional loops for large datasets.
3. **`some` method**: Similar to `forEach`, but stops iterating as soon as the callback function returns `false`.
	* Pros: Can be faster than `forEach` when searching for a condition that needs to be false.
	* Cons: May not be suitable for all use cases (e.g., requires manual termination).
4. **`for...of` loops**: These loops iterate over an array or other iterable using a structured loop syntax.
	* Pros: Modern and concise, can be used with any type of data.
	* Cons: Less familiar to older developers, may require additional setup.
5. **`for...in` loops**: These loops iterate over the properties of an object, not necessarily its array elements.
	* Pros: Can be useful for iterating over objects or arrays with property names that are meaningful to the user.
	* Cons: May lead to bugs if used with arrays instead of objects.

**Special JavaScript Features**

In this benchmark, we don't see any special JavaScript features like `let`/`const`, arrow functions, or classes. If you'd like me to explain those in more detail, I can do so!

**Benchmark Preparation Code**

The provided code creates an array with 100 elements using the line: `var array = new Array(100);`.

**Individual Test Cases**

Each test case represents a different loop construct being compared. For example:

* `array.forEach(function(i) { ... });`: This is a `forEach` method call, which iterates over the array and calls the callback function for each element.
* `for (var i = 0; i < array.length; i++) { ... };`: This is a traditional `for` loop that uses an explicit counter variable.

**Latest Benchmark Results**

The results show the performance of each loop construct in terms of executions per second. The `some` method and `for...of` loops are generally faster than traditional `for` loops, while the `forEach` method is slower due to its additional overhead.

Keep in mind that these results may vary depending on the specific use case, hardware, and JavaScript version being used.

Related benchmarks:

for vs foreach vs some vs for..of vs for..in-jer (version: 0)

Compare loop performance

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

Created: 3 years ago by: Guest

Jump to the latest result

for

foreach

some

for..of

for..in

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):