Benchmark: Array.prototype.forEach vs _.each vs js for

HTML Preparation code:

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.core.js"></script>

Tests:

foreach
var params = [ "hello", true, 7 ]; var index = 0; params.forEach(param => index++);
lodash each
var params = [ "hello", true, 7 ]; var index = 0; _.each(params, param => index++);
for
var params = [ "hello", true, 7 ]; var index = 0; for(var i in params){ index++; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
foreach
lodash each
for

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Windows

View result in a separate tab

Test name	Executions per second
foreach	184501328.0 Ops/sec
lodash each	25645412.0 Ops/sec
for	6228597.5 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the benchmark.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmarking test on MeasureThat.net. The test compares the performance of three different approaches: `Array.prototype.forEach`, `_` (Lodash) `.each`, and traditional `for` loop.

**Options Compared**

1. **Array.prototype.forEach**: This method is a built-in JavaScript function that iterates over an array, executing the provided callback function for each element.
2. **_ (Lodash) .each**: Lodash is a popular utility library for JavaScript. The `.each` method is part of it, allowing users to iterate over arrays in a similar way to `forEach`.
3. **Traditional for loop**: A classic approach to iterating over an array using a loop with an index variable.

**Pros and Cons**

1. **Array.prototype.forEach**:
	* Pros: Built-in JavaScript function, easy to use, good performance.
	* Cons: Can be slower than native code when used in loops or with large arrays.
2. **_ (Lodash) .each**:
	* Pros: Provides a simple and consistent way to iterate over arrays, especially useful for developers familiar with Lodash.
	* Cons: Requires an additional library import, might introduce overhead due to the extra function call.
3. **Traditional for loop**:
	* Pros: Generally fast and efficient, easy to understand and implement.
	* Cons: Can be error-prone if not implemented correctly, especially when dealing with array indices.

**Library (Lodash) and its purpose**

Lodash is a utility library that provides a set of functions to perform various tasks in JavaScript, such as iterating over arrays. The `.each` method allows users to iterate over an array, executing the provided callback function for each element. In this benchmark, Lodash is used to provide an alternative implementation of iteration.

**Special JS feature or syntax**

None mentioned explicitly in the provided code snippets. However, it's worth noting that JavaScript supports various features and syntaxes, such as ES6 promises, async/await, and generators, which might be relevant in more complex benchmarks.

**Other alternatives**

If you're interested in exploring alternative approaches, consider:

* `Array.prototype.forEach` variants: Some browsers or environments provide faster versions of `forEach`, like WebKit's `forEachSlow`.
* Iterators and generators: JavaScript provides iterators and generators as a way to iterate over arrays without using traditional loops.
* Native WebAssembly (WASM) implementations: Some browsers support WASM, which can be used to run optimized, low-level code for specific tasks.

Keep in mind that the best approach depends on the specific use case, performance requirements, and personal preference.

Related benchmarks:

Array.prototype.forEach vs _.each vs js for (version: 0)

Compare the new ES6 spread operator with the traditional concat() method

Comparing performance of: foreach vs lodash each vs for

Created: 6 years ago by: Guest

Jump to the latest result

foreach

lodash each

for

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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