Benchmark: lodash forEach vs for i loop forof

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/lodash/4.16.0/lodash.min.js"></script>

Script Preparation code:

var values = [{
    a: 30310
}, {
    b: 100303
}, {
    c: 3040494
}]
var valArr = [];

for (let i = 0; i < 20000; i++) {
    valArr.push({
        a: 1,
        b: 2,
        c: 3
    });
}

Tests:

lodash.forEach
var count = 0; _.forEach(valArr, function(v,i) { if (v.a != null) { count++; } })
native
var count = 0; for (let v of valArr) { if (v.a != null) { count++; } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash.forEach
native

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_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36

Browser/OS: Chrome 84 on Mac OS X 10.14.6

View result in a separate tab

Test name	Executions per second
lodash.forEach	2565.9 Ops/sec
native	25043.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definition and test cases to explain what's being tested.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark that compares two approaches: `forEach` with Lodash library, and a native `for...of` loop. The benchmark is designed to measure which approach executes faster on a specific test case.

**Options Compared**

Two options are compared:

1. **Lodash `.forEach()`**: This uses the `_` alias for the Lodash library and calls the `forEach()` function on the `valArr` array.
2. **Native `for...of` loop**: This is an iterative approach using a traditional `for` loop with the `of` keyword to iterate over the elements of the `valArr` array.

**Pros and Cons**

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

**Lodash `.forEach()`**

Pros:

* Simplifies iteration over arrays
* Provides a standardized way to perform operations on arrays

Cons:

* Introduces an external library dependency
* May incur overhead due to function calls and object lookup

**Native `for...of` loop**

Pros:

* No external library dependencies
* Can be optimized by the JavaScript engine for better performance

Cons:

* Requires manual management of iteration variables (e.g., index)
* May require additional code to handle array indexing

**Other Considerations**

In general, when choosing between these two approaches, consider the trade-offs between simplicity and performance.

If you need to perform frequent iterations over large arrays or datasets, the native `for...of` loop might be a better choice due to its potential for better performance. However, if you prioritize code readability and maintainability, the Lodash `.forEach()` method can simplify your code.

**Library: Lodash**

The provided benchmark uses the Lodash library, which is a popular JavaScript utility library that provides various functions for working with arrays, objects, and more. The `_.forEach()` function is used to iterate over the elements of an array and perform operations on each element.

**Special JS Feature/Syntax (not applicable in this case)**

There are no special JavaScript features or syntax introduced in this benchmark beyond what's standard in modern JavaScript implementations.

**Alternatives**

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

1. **Array.prototype.forEach()**: Similar to Lodash `.forEach()`, but built into the standard Array prototype.
2. **For loops with indices**: Using traditional `for` loops with manual index management can be a viable option, especially when performance is critical.
3. **Other libraries or frameworks**: Depending on your specific use case and requirements, other libraries like React's `map()` and `forEach()` functions or frameworks like RxJS might provide more suitable alternatives for iterating over data structures.

Keep in mind that the choice of iteration approach ultimately depends on your project's specific needs, performance requirements, and codebase conventions.

Related benchmarks:

lodash forEach vs for i loop forof (version: 0)

Comparing performance of: lodash.forEach vs native

Created: 4 years ago by: Guest

Jump to the latest result

lodash.forEach

native

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):