Benchmark: indexOf vs findIndex 99999sss

Script Preparation code:


var arr = ['one', 'two', 'three'];


function testIndex(x){
	return x === 'one';
}
function test(){
	return 'one';
}

Tests:

findIndex
arr.findIndex(testIndex)
indexOf
arr.indexOf(test())

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 is being tested.

**Benchmark Definition**

The benchmark definition is represented by two JSON objects, each containing a unique `Benchmark Definition` string that defines how to run a test case. The `findIndex` and `indexOf` functions are being compared in these test cases.

**What is being tested?**

In the first test case (`arr.findIndex(testIndex)`), the `findIndex` function is being called with a reference to an object (`testIndex`) as its argument. This means that the `findIndex` function will search for the specified object in the array and return the index of the first occurrence.

In the second test case (`arr.indexOf(test())`), the `indexOf` function is being called with the result of calling another function (`test()`) as its argument. In this case, the `test()` function returns a string literal `'one'`. This means that the `indexOf` function will search for the specified string in the array and return the index of the first occurrence.

**Options compared**

The two options being compared are:

1. `findIndex`: This method searches for an element in an array by comparing each element to the provided value. It returns `-1` if no match is found.
2. `indexOf`: This method searches for a substring or a string value within a string array. It returns `-1` if no match is found.

**Pros and Cons**

Here are some pros and cons of each approach:

**findIndex:**

Pros:

* More efficient than `indexOf` because it can stop searching as soon as the first element is not equal to the provided value.
* Can handle non-string values, including objects and arrays.

Cons:

* Requires an object reference as its argument, which may be less intuitive for some developers.
* May have performance overhead due to the use of the `===` operator to compare elements.

**indexOf:**

Pros:

* Less dependent on object references, making it more accessible to beginners.
* Can handle string substrings, making it a good choice for searching within strings.

Cons:

* Requires a string value as its argument, which may limit its usefulness in certain scenarios.
* May not be as efficient as `findIndex` because it has to iterate over the entire array.

**Library and syntax**

There is no library being used in these test cases. The `findIndex` and `indexOf` methods are built-in JavaScript methods that can be used directly.

**Special JS feature or syntax**

None of the provided test cases use any special JavaScript features or syntax beyond what is required by the standard JavaScript language. However, it's worth noting that modern browsers may have additional features or optimizations not included in this benchmark.

**Other alternatives**

If you want to explore other alternatives for searching within arrays, here are a few options:

1. `Array.prototype.some()`: This method returns `true` as soon as the callback function returns `true` for at least one element in the array.
2. `Array.prototype.every()`: This method returns `true` if the callback function returns `true` for every element in the array.
3. Custom loops or recursive functions: These can be used to implement custom searching algorithms, but they may not be as efficient or elegant as built-in methods like `findIndex`.

Keep in mind that this benchmark is focused on comparing the performance of `findIndex` and `indexOf`, so exploring alternative search algorithms might not provide meaningful results for this specific test case.

Related benchmarks:

indexOf vs findIndex 99999sss (version: 0)

Comparing performance of: findIndex vs indexOf

Created: 5 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):