Benchmark: is find faster than forEach?

Script Preparation code:

            var arr = Array(10000).map((_, i)=>i);

Tests:

forEach
arr.forEach(()=>null)
find
arr.find((item)=> item === 100)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
forEach
find

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its components.

**Benchmark Definition**

The benchmark is designed to compare the performance of two JavaScript methods: `forEach` and `find`. The goal is to determine which method is faster for finding an item in an array.

**Script Preparation Code**

The script preparation code creates an array with 10,000 elements using the `Array.prototype.map()` method. Each element is assigned a value equal to its index in the array (i.e., `arr[i] = i`).

This code sets up a consistent data structure for both methods being compared.

**Html Preparation Code**

There is no HTML preparation code, which means that this benchmark is focused solely on the JavaScript engine's performance and does not take into account any HTML-related overhead.

**Individual Test Cases**

We have two test cases:

1. `arr.forEach(() => null)`: This method calls the callback function for each element in the array without returning anything.
2. `arr.find((item) => item === 100)`: This method returns the first element in the array that satisfies the condition (i.e., `item === 100`).

**Library Usage**

In this benchmark, there is no explicit library usage, but it's worth noting that `Array.prototype.map()` and `Array.prototype.find()` are both part of the ECMAScript standard.

**Special JavaScript Feature/Syntax**

There are no special JavaScript features or syntaxes being tested in this benchmark. The focus is on comparing the performance of two built-in methods.

**Pros and Cons of Different Approaches**

The choice between `forEach` and `find` depends on your specific use case:

* `forEach`: This method is useful when you need to perform some action for each element in an array without modifying the original array. However, it can be slower than `find` because it has to iterate over the entire array.
* `find`: This method returns the first element that satisfies a given condition and stops iterating as soon as found. It's often faster than `forEach` but may return `undefined` if no element matches.

**Considerations**

When choosing between `forEach` and `find`, consider the following:

* If you need to perform some action for each element without modifying the original array, use `forEach`.
* If you need to find a specific element that satisfies a condition and stop iterating, use `find`.

**Other Alternatives**

Some alternative approaches to compare elements in an array include:

* Using `for` loops: This can be more explicit but slower than using built-in methods.
* Using libraries like Lodash or Ramda: These libraries provide additional functionality for working with arrays, but may add overhead due to the library itself.

Keep in mind that performance differences between these approaches will vary depending on the specific use case and implementation.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36

Browser/OS: Chrome 96 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
forEach	68825.9 Ops/sec
find	18782.5 Ops/sec

Related benchmarks:

is find faster than forEach? (version: 0)

Comparing performance of: forEach vs find

Created: 2 years ago by: Guest

Jump to the latest result

forEach

find

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):