Benchmark: JS find vs indexOf u

Script Preparation code:

var arr = [];
var i = 0;

while (i <= 1E5) arr[i] = i++;

Tests:

Array.find
const item = arr.find(item => item === 1E5);
Array.indexOf
const index = arr.indexOf(1E5);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.find
Array.indexOf

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser/OS: Chrome 134 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Array.find	4980.7 Ops/sec
Array.indexOf	151867.2 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its test cases.

**Benchmark Overview**

The benchmark compares two JavaScript methods for finding a specific element in an array: `Array.prototype.find()` and `Array.prototype.indexOf()`. The tests are designed to measure the performance difference between these two methods.

**Script Preparation Code**

The script preparation code creates an array `arr` with 100,000 elements, where each element is initialized to its index value (`i`). This array will be used as input for both tests.

```javascript
var arr = [];
var i = 0;

while (i <= 1E5) {
    arr[i] = i++;
}
```

This code creates a large array with a linear progression of values, which is expected to be present in the array during the benchmarking process.

**Benchmark Definition**

The `Benchmark Definition` section contains two test cases:

1. **Array.find**: This test case uses the `find()` method to find an element with a value equal to 100,000.
```javascript
const item = arr.find(item => item === 1E5);
```
This method returns the first element in the array that satisfies the provided condition.

2. **Array.indexOf**: This test case uses the `indexOf()` method to find the index of an element with a value equal to 100,000.
```javascript
const index = arr.indexOf(1E5);
```
This method returns the index of the first occurrence of the specified value in the array.

**Options Compared**

The benchmark compares two options:

1. **Array.prototype.find()**: This method uses a callback function to specify the condition for finding an element.
2. **Array.prototype.indexOf()**: This method uses a direct comparison to find the index of an element.

**Pros and Cons**

* **Array.prototype.find():**
	+ Pros:
		- Returns the first matching element, which can be useful in certain scenarios.
		- Less prone to off-by-one errors compared to `indexOf()`.
	+ Cons:
		- Generally slower than `indexOf()` due to its callback-based approach.
* **Array.prototype.indexOf():**
	+ Pros:
		- Faster than `find()` since it uses a direct comparison.
		- Returns the index of the first occurrence, which can be useful in certain scenarios.
	+ Cons:
		- May return an incorrect result if the value is not present in the array (returns -1).
		- More prone to off-by-one errors due to its indexing nature.

**Library and Special JS Features**

There are no external libraries used in this benchmark. However, it's worth noting that `find()` was introduced in ECMAScript 2015 (ES6), so it may not be supported in older browsers or environments.

**Other Alternatives**

If you're interested in exploring other methods for finding elements in an array, here are a few alternatives:

1. **Array.prototype.some()**: Returns `true` if at least one element satisfies the condition.
2. **Array.prototype every()**: Returns `true` if all elements satisfy the condition.
3. **Manual loop**: You can use a manual loop to iterate through the array and find the desired element.

Keep in mind that these alternatives may have different performance characteristics compared to `find()` and `indexOf()`.

Related benchmarks:

JS find vs indexOf u (version: 0)

JS find vs indexOf

Comparing performance of: Array.find vs Array.indexOf

Created: 3 years ago by: Guest

Jump to the latest result

Array.find

Array.indexOf

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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