Benchmark: native for loop vs Array.prototype.forEach vs lodash forEach

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var arr = _.range(10000)

Tests:

for loop
for(let i = 0; i < arr.length; i++) {}
Array.prototype.forEach
arr.forEach(ele => {})
lodash each
_.forEach(arr, ele => {})

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for loop
Array.prototype.forEach
lodash each

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.120 Safari/537.36

Browser/OS: Chrome 77 on Mac OS X 10.15.3

View result in a separate tab

Test name	Executions per second
for loop	1633.5 Ops/sec
Array.prototype.forEach	19314.9 Ops/sec
lodash each	8705.3 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what's being tested.

**Benchmark Definition**

The benchmark is comparing three approaches to iterate over an array:

1. **Native For Loop**: A traditional for loop that uses a counter variable (`i`) to access each element in the array.
2. **Array.prototype.forEach**: A method on the Array prototype that iterates over the elements of an array, executing a callback function for each element.
3. **Lodash `forEach`**: A utility function from the Lodash library that applies a given function to every element in an array.

**Options Compared**

The benchmark is comparing these three options based on their performance:

* Native For Loop: Uses a traditional loop with a counter variable, which can be slower due to the overhead of incrementing the counter and checking if it's within bounds.
* Array.prototype.forEach: Uses the built-in method for iterating over arrays, which is optimized for performance. However, it may have additional overhead due to the function call and argument passing.
* Lodash `forEach`: Uses a third-party library that provides an optimized implementation of the for-each loop.

**Pros and Cons**

Here are some pros and cons of each approach:

1. **Native For Loop**:
	* Pros: Easy to implement, lightweight, and doesn't require additional libraries.
	* Cons: Can be slower due to counter incrementation and bounds checking.
2. **Array.prototype.forEach**:
	* Pros: Optimized for performance, built-in method, and concise syntax.
	* Cons: May have additional overhead due to function call and argument passing.
3. **Lodash `forEach`**:
	* Pros: Optimized implementation, fast execution time, and convenient syntax.
	* Cons: Requires an additional library dependency.

**Library Used**

The benchmark uses the Lodash library, which is a popular utility library for JavaScript. In this case, it's used to provide a consistent implementation of the `forEach` method across different environments.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntaxes being tested in this benchmark. The focus is on comparing the performance of three basic iteration approaches.

**Other Alternatives**

If you're looking for alternative libraries or implementations, here are a few options:

* **ES6 `for...of` loop**: A newer way to iterate over arrays using a for-of loop.
* **Native `Array.prototype.map()` and `reduce()` methods**: Alternative methods for transforming and reducing arrays, which may be faster than the for-each loop in some cases.

Keep in mind that the choice of iteration approach depends on your specific use case and performance requirements. This benchmark provides a useful comparison of three common approaches, but you should consider other factors when deciding on an implementation.

Related benchmarks:

native for loop vs Array.prototype.forEach vs lodash forEach (version: 0)

Comparing performance of: for loop vs Array.prototype.forEach vs lodash each

Created: 4 years ago by: Guest

Jump to the latest result

for loop

Array.prototype.forEach

lodash each

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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