Benchmark: IndexOf vs FindIndex 3

Script Preparation code:


var arr = [
  {id: 1, name: 'ola1'},
  {id: 2, name: 'ola2'},
  {id: 3, name: 'ola3'},
  {id: 4, name: 'ola4'},
  {id: 5, name: 'ola5'},];

Tests:

FindIndex
function check(item) { return item.id === 5; } arr.findIndex(check)
indexOf
var last = {id: 5, name: 'ol5'} arr.indexOf(last);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
FindIndex
indexOf

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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Let's break down the provided JSON and explain what is being tested, compared, and some of the considerations involved.

**Benchmark Definition**

The benchmark definition is a set of instructions that outline how to prepare the test environment and execute the test. In this case, there are two separate benchmarks:

1. `IndexOf vs FindIndex 3`: This benchmark tests the performance difference between using `indexOf()` and `findIndex()`. The script preparation code provides an array of objects (`arr`) with different IDs.
2. Each individual test case has its own benchmark definition, which consists of:
	* A JavaScript function (`check`) that takes an item as input and returns a boolean value indicating whether the item's ID matches 5.
	* The corresponding method call: either `arr.findIndex(check)` (FindIndex) or `arr.indexOf(last)` (IndexOf), where `last` is an object with ID 5.

**What is being tested?**

The main goal of this benchmark is to compare the performance of two different methods for searching an array:

1. `findIndex()`: This method returns the index of the first element that satisfies the provided callback function. If no elements satisfy the condition, -1 is returned.
2. `indexOf()`: This method returns the index of the first occurrence of a specified value in the array. If the value is not found, -1 is returned.

**Options compared**

The two methods are being tested for their performance difference. The main differences between them are:

* Return type: `findIndex()` returns an index (or -1 if not found), while `indexOf()` also returns an index or -1.
* Behavior when no matches are found: Both methods return -1, but `findIndex()` may throw an error if the callback function is not provided correctly.

**Pros and Cons**

Here are some pros and cons of each approach:

* `findIndex()`:
	+ Pros:
		- Returns the index of the first matching element.
		- Can be used with a callback function for more complex searches.
	+ Cons:
		- May throw an error if the callback function is not provided correctly.
		- Can be slower than `indexOf()` in some cases due to its flexibility.
* `indexOf()`: 
	+ Pros:
		- Returns the index of the first occurrence, which can be faster for simple searches.
		- Less error-prone than `findIndex()`.
	+ Cons:
		- Limited to searching for a specific value.

**Library and special JavaScript features**

There is no library used in this benchmark. However, it does utilize some special JavaScript features:

* Callback functions: The `check` function and the callback provided to `findIndex()` use a callback function to define the search criteria.
* Object literals: The script preparation code uses object literals to create an array of objects (`arr`).

**Other alternatives**

If you need to perform more complex searches or have specific requirements not met by these two methods, consider using:

* `Array.prototype.some()` and `Array.prototype.every()`: These methods test whether any or all elements in the array satisfy a condition.
* `Array.prototype.filter()`: This method returns an array with only the elements that pass the provided callback function.
* Third-party libraries like Lodash or Moment.js, which provide more advanced search functionality.

In conclusion, this benchmark provides a simple and controlled way to compare the performance of two essential JavaScript methods for searching arrays: `findIndex()` and `indexOf()`.

Related benchmarks:

IndexOf vs FindIndex 3 (version: 0)

Comparing performance of: FindIndex vs indexOf

Created: 6 years ago by: Guest

Jump to the latest result

FindIndex

indexOf

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):