Benchmark: different iteration methods

Script Preparation code:

var array = new Array(100);

Tests:

traditional 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]; }
find
array.find(function(i) { array[i]; });
every
array.every(function(i) { array[i]; });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
traditional for
foreach
some
for..of
find
every

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36

Browser/OS: Chrome 81 on Windows

View result in a separate tab

Test name	Executions per second
traditional for	47235.8 Ops/sec
foreach	2749254.5 Ops/sec
some	2906205.8 Ops/sec
for..of	74169.5 Ops/sec
find	71097.0 Ops/sec
every	2866436.8 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**Benchmark Definition**

The provided JSON represents a benchmark definition, which outlines the test case and its requirements. In this case, the benchmark compares the performance of different iteration methods in JavaScript:

1. Traditional `for` loop
2. `forEach`
3. `some`
4. `for..of`
5. `find`
6. `every`

**Options Compared**

The options being compared are:

* Iteration methods: `for`, `forEach`, `some`, `for..of`, `find`, and `every`. Each method has its own strengths and weaknesses, which we'll discuss below.

**Pros and Cons of Different Approaches**

Here's a brief overview of the pros and cons of each iteration method:

1. **Traditional `for` loop**:
	* Pros: Control over indexing, potential for better performance in certain cases.
	* Cons: Can be verbose, prone to off-by-one errors.
2. **`forEach`**:
	* Pros: Concise syntax, less error-prone than traditional loops.
	* Cons: May not provide direct control over indexing or iteration logic.
3. **`some`** and **`every`**:
	* Pros: Built-in methods for testing conditions on arrays, concise syntax.
	* Cons: May not be suitable for iterating over entire arrays; can be slower than traditional loops in some cases.
4. **`for..of`**:
	* Pros: Modern, concise syntax; provides direct control over iteration logic.
	* Cons: Introduced in ECMAScript 2015, may not support older browsers or versions of JavaScript.

**Library Used**

The `forEach`, `some`, and `every` methods are built-in to JavaScript and do not rely on external libraries. However, they do utilize the `Array.prototype` methods, which are part of the JavaScript standard library.

**Special JS Feature/Syntax**

None of the provided iteration methods use any special or advanced JavaScript features such as generators, async/await, or lambda functions. They all follow traditional synchronous syntax.

**Alternative Approaches**

If you're looking for alternative approaches to iterating over arrays in JavaScript, consider:

1. **`map()`**: Similar to `forEach`, but returns a new array with transformed elements.
2. **`reduce()`**: Performs a reduction operation on the array, often used for summing or aggregating values.
3. **Array.prototype.reduceRight()`: Similar to `reduce()`, but iterates over the array from right to left.

These alternative approaches can provide different use cases and benefits, depending on your specific requirements.

**Benchmark Results**

The provided benchmark results show the execution frequency per second for each iteration method on a Windows desktop with Chrome 81. The results suggest that:

1. `forEach` is the fastest method, likely due to its optimized implementation.
2. `some` and `every` are slower than traditional loops but still relatively fast.
3. `for..of` is the slowest method, possibly due to its modern syntax and potential overhead.

Keep in mind that these results may vary depending on your specific use case, array size, and browser/JavaScript version.

Related benchmarks:

different iteration methods (version: 0)

Compare loop performance

Comparing performance of: traditional for vs foreach vs some vs for..of vs find vs every

Created: 4 years ago by: Guest

Jump to the latest result

traditional for

foreach

some

for..of

find

every

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):