Benchmark: find in array of objects by field 1002

Script Preparation code:

var arr = []

for(let i = 0;i<10000;i++) arr[i] = {name: `listitem${i}`, id: i};

Tests:

find
arr.find((id) => id === 7999)
findIndex
arr.findIndex((id) => id === 7999)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
find
findIndex

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 provided benchmark definition and test cases.

**Benchmark Definition**

The benchmark definition represents a JavaScript microbenchmark that measures the performance of two different methods: `Array.prototype.find()` and `Array.prototype.findIndex()`. Both methods are used to find the first element in an array that satisfies a given condition.

**Script Preparation Code**

The script preparation code generates an array of 10,000 objects with a unique ID and name. This is done using a for loop that creates each object and adds it to the array.

`var arr = [];`

`for (let i = 0; i < 10000; i++) {`

`arr[i] = { name: `listitem${i}`, id: i };`

This code ensures that the benchmark is run on an array of a reasonable size, which can help to isolate the effect of the JavaScript engine or browser.

**Test Cases**

There are two test cases:

1. **find**: This test case uses the `Array.prototype.find()` method to find the first element in the array that has an ID equal to 7999.
2. **findIndex**: This test case uses the `Array.prototype.findIndex()` method to find the index of the first element in the array that has an ID equal to 7999.

**Options Compared**

The two methods are compared, but they have different approaches:

1. **Find()**: This method returns the value of the first element that satisfies the condition. If no elements satisfy the condition, it returns `undefined`.
2. **FindIndex()**: This method returns the index of the first element that satisfies the condition. If no elements satisfy the condition, it returns -1.

**Pros and Cons**

Here are some pros and cons of each approach:

* **Find()**
	+ Pros:
		- More intuitive for developers who are familiar with the `find()` method in other contexts.
		- Less work is done by the engine to handle the case where no elements satisfy the condition.
	+ Cons:
		- If an element is found, it's returned by value, which can lead to unnecessary copies of the element.
* **FindIndex()**
	+ Pros:
		- More efficient in terms of memory usage because it returns the index directly instead of a value.
		- Still performs well even when no elements satisfy the condition.
	+ Cons:
		- May be less intuitive for developers who are familiar with other languages or contexts.

**Library and Purpose**

In this case, there is no external library being used. The `Array.prototype.find()` and `Array.prototype.findIndex()` methods are built-in methods of JavaScript arrays.

**Special JS Feature/Syntax**

There isn't any special JavaScript feature or syntax being tested here. These two methods are standard methods in JavaScript that have been available since the language's inception.

**Other Alternatives**

If you're interested in exploring other alternatives, some options include:

1. **For loop**: You could use a for loop to iterate over the array and find the first element that satisfies the condition.
2. ** filter() + [0]**: You could use the `filter()` method to create a new array with only the elements that satisfy the condition, and then access the first element of that array using `[0]`.
3. **forEach()**: You could use the `forEach()` method to iterate over the array and find the first element that satisfies the condition.

However, these alternatives would likely have different performance characteristics compared to the built-in `find()` and `findIndex()` methods.

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.54 Safari/537.36

Browser/OS: Chrome 101 on Windows

View result in a separate tab

Test name	Executions per second
find	11624.7 Ops/sec
findIndex	10872.0 Ops/sec

Related benchmarks:

find in array of objects by field 1002 (version: 0)

Comparing performance of: find vs findIndex

Created: 2 years ago by: Guest

Jump to the latest result

find

findIndex

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):