Benchmark: findIndex vs indexOf - objects

Script Preparation code:

var arr = [];
var count = 1000;
var obj600 = {name:'obj600', sometext:'dsskdfksdfkls', date:new Date()};
for(let i = 0; i < 1000; i++){
	if(i===600){
      arr.push(obj600);
	  continue;
	}
    arr.push({
        name: '' + Math.random(),
        sometext: Math.random()+''+Math.random()+''+Math.random()+''+Math.random()+''+Math.random(),
        date: new Date()
    });
}

Tests:

findIndex
var index = arr.findIndex((obj) => obj.name === 'name600');
indexOf
var index = arr.indexOf(obj600);

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):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Definition**
The benchmark is designed to compare the performance of two JavaScript methods: `Array.prototype.findIndex()` and `Array.prototype.indexOf()`. Both methods are used to find the index of a specific element in an array.

**Script Preparation Code**
The script preparation code creates an array `arr` with 1000 elements. One element, `obj600`, is specifically defined with a unique property `name` set to `'obj600'`. The other 999 elements are generated randomly with similar properties. This setup simulates a scenario where you might need to find a specific element in the array.

**Html Preparation Code**
There is no HTML preparation code provided, which means that the benchmark doesn't rely on any external factors like DOM manipulation or network requests.

**Individual Test Cases**
The two test cases are:

1. `findIndex`: Uses `Array.prototype.findIndex()` to find the index of `obj600` in the array.
2. `indexOf`: Uses `Array.prototype.indexOf()` to find the index of `obj600` in the array.

**Pros and Cons**

* **`findIndex()`**: This method is generally faster for arrays because it returns `-1` if the element is not found, whereas `indexOf()` returns `NaN` (Not a Number) in such cases. However, some browsers may optimize this behavior to use a more efficient algorithm. Additionally, `findIndex()` can be less intuitive and may lead to unexpected results if not used carefully.
* **`indexOf()`**: This method is generally slower than `findIndex()`, but it's often simpler to implement and understand. It also returns `-1` if the element is not found.

**Library: None**
There are no libraries or external dependencies mentioned in the benchmark.

**Special JS Feature/Syntax:**
None of the benchmark tests use any special JavaScript features or syntax beyond what's standard for JavaScript.

**Other Considerations**

* The benchmark uses a small array with 1000 elements, which may not be representative of larger datasets.
* The `obj600` element is specifically defined to ensure that both methods can find it. However, in real-world scenarios, the element might have more complex properties or values.

**Alternatives**

Other alternatives for finding an index in an array include:

1. Using a custom loop: Iterate over the array and check each element against the target value.
2. Using `Array.prototype.some()`: Check if any elements in the array satisfy a condition, which can be slower than `findIndex()` or `indexOf()`.
3. Using `Array.prototype.every()`: Check if all elements in the array satisfy a condition, which can be slower than `findIndex()` or `indexOf()`.
4. Using `Map` data structure: Store the array as a Map with string keys and values, then use `Map.get()` to retrieve the element.

Keep in mind that the choice of method depends on the specific requirements and performance characteristics of your application.

Related benchmarks:

findIndex vs indexOf - objects (version: 0)

Comparing performance of: findIndex vs indexOf

Created: 4 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):