Benchmark: lodash forEach vs for i loop

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}]

Tests:

lodash.forEach
var count = 0; _.forEach(values, function(v,i) { if (v.a != null) { count++; } })
native
var count = 0; for (var i = 0; i < values.length; i++) { if (values[i].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: 2 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36

Browser/OS: Chrome 145 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
lodash.forEach	39191400.0 Ops/sec
native	61433908.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to explain the JavaScript benchmark and its various components.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run microbenchmarks in JavaScript. The goal of these benchmarks is to compare the performance of different approaches to achieve a specific task, such as iterating over an array of objects.

**Script Preparation Code**

The script preparation code is a snippet of JavaScript that sets up the environment for the benchmark:
```javascript
var values = [{a: 30310}, {b: 100303}, {c: 3040494}];
```
This code creates an array `values` with three objects, each containing a property `a`. The purpose of this script is to provide a fixed dataset that will be used in the benchmark.

**Html Preparation Code**

The HTML preparation code includes a reference to the Lodash library:
```html
<script src="https://cdn.jsdelivr.net/lodash/4.16.0/lodash.min.js"></script>
```
Lodash (a popular utility library for JavaScript) provides various functions that can be used in the benchmark, including `forEach`.

**Individual Test Cases**

There are two test cases:

1. **Lodash `forEach`**: This test case uses the Lodash `forEach` function to iterate over the `values` array:
```javascript
_.forEach(values, function(v,i) {
  if (v.a != null) {
    count++;
  }
})
```
The purpose of this test is to measure the performance of using the Lodash `forEach` function.

2. **Native `for` loop**: This test case uses a traditional `for` loop to iterate over the `values` array:
```javascript
for (var i = 0; i < values.length; i++) {
  if (values[i].a != null) {
    count++;
  }
}
```
The purpose of this test is to measure the performance of using a traditional `for` loop.

**Benchmark Results**

The latest benchmark results show two tests running in Chrome 128 on a desktop with Windows:

1. **Lodash `forEach`**: This test case executed approximately 7,620,873 times per second.
2. **Native `for` loop**: This test case executed approximately 4,430,573 times per second.

**Library: Lodash**

Lodash is a popular utility library for JavaScript that provides various functions for tasks such as string manipulation, array manipulation, and more. In this benchmark, Lodash's `forEach` function is used to iterate over the `values` array.

**Special JS Feature/ Syntax**: None mentioned in this explanation.

**Other Alternatives**

If you wanted to test alternative approaches to iterating over an array of objects, some other options might include:

* Using a `for...in` loop
* Using a `while` loop with an index variable
* Using a library like Moment.js (which provides a `forEach` function)
* Implementing a custom iteration function using a recursive or iterative approach

Keep in mind that the performance of these alternatives may vary depending on the specific use case and JavaScript environment.

Related benchmarks:

lodash forEach vs for i loop (version: 0)

Comparing performance of: lodash.forEach vs native

Created: 7 years ago by: Guest

Jump to the latest result

lodash.forEach

native

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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