Benchmark: indexOf vs. find

Script Preparation code:

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

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
indexof
find

Fastest: N/A

Slowest: N/A

Latest run results:

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

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

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmarking test case, where two different approaches are compared: `indexOf` and `find`. The benchmark is designed to measure the performance of these two methods in finding an element with a specific value (in this case, 10,000) within a large array.

**Benchmark Definition**

The benchmark definition JSON consists of three main parts:

* **Name**: The name of the benchmark, which is "indexOf vs. find".
* **Description**: An empty string, indicating that there is no descriptive text for this benchmark.
* **Script Preparation Code**: A script that generates a large array `arr` with 100,000 elements, where each element is initialized to its index value (from 0 to 99,999). The `while` loop increments the index and assigns it to the corresponding array element. This script prepares the input data for the benchmark.
* **Html Preparation Code**: An empty string, indicating that there is no HTML-related preparation code needed.

**Individual Test Cases**

The JSON contains two test cases:

1. **indexof**: This test case uses the `indexOf` method to find the index of the element with value 10,000 in the generated array.
2. **find**: This test case uses the `find` method with an arrow function (a shorthand for a function expression) to find the first element in the array that matches the value 10,000.

**Library and Purpose**

In both test cases, no external libraries are used. However, the `find` method relies on the `Array.prototype.find()` method, which is a built-in JavaScript method. The `indexOf` method also uses an internal implementation provided by the browser.

**Special JS Features/Syntax**

Neither of the benchmarked methods involves any special or advanced JavaScript features. They are standard JavaScript methods that have been part of the language since its inception.

**Options Compared**

The two test cases compare the performance of the following options:

* `indexOf`: A traditional method for finding an element in an array by checking the indices of each element.
* `find`: A more modern approach using the `Array.prototype.find()` method, which is designed to be more efficient and flexible.

**Pros and Cons**

Here are some pros and cons of each approach:

**`indexOf`:**

Pros:

* Well-established and widely supported
* Easy to understand and implement

Cons:

* Can be slower for large arrays due to the need to iterate over indices
* May not be as efficient as other methods, like `find`, when dealing with larger arrays

**`find`:**

Pros:

* More efficient for large arrays using internal implementation optimizations
* Supports more flexible search criteria (e.g., callback functions)

Cons:

* Less widely supported than `indexOf`
* May have slightly higher overhead due to the use of a built-in method

**Other Alternatives**

If you're looking for alternative methods, here are some options:

* **Array.prototype.indexOf()**: This is another way to invoke the `indexOf` method, using a function call instead of a dot notation.
* **Array.prototype.findIndex()**: Similar to `find`, but returns -1 if no element is found, instead of null (in older browsers).
* **ES6 Array.prototype.find() and Array.prototype.findIndex()` methods: These are the modern, built-in methods for finding elements in arrays.

Keep in mind that the performance differences between these methods can be subtle and may depend on various factors, such as the size of the array, the hardware, and the JavaScript engine being used.

Related benchmarks:

indexOf vs. find (version: 0)

Comparing performance of: indexof vs find

Created: 4 years ago by: Guest

Jump to the latest result

indexof

find

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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