Benchmark: find vs findIndex (Array prototype methods) 2

Script Preparation code:

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

Tests:

Array.prototype.find
const item = arr.find(item => item == 1E5);
Array.prototype.findIndex
const index = arr.findIndex(item => item == 1E5);
classic for loop
function forfinder(arr) { var cl = arr.length for(var i = 0; i < cl; i++) { if(arr[i] == 1e5) { return i } } return -i } const index = forfinder(arr)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.find
Array.prototype.findIndex
classic for loop

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.

**What is being tested?**

The provided benchmark tests the performance of three different approaches to find an element in an array: `Array.prototype.find()`, `Array.prototype.findIndex()`, and a classic for loop.

**Options compared:**

1. **`Array.prototype.find()`**: This method returns the first element in the array that satisfies the provided testing function.
2. **`Array.prototype.findIndex()`**: This method returns the index of the first element in the array that satisfies the provided testing function.
3. **Classic for loop**: This approach uses a traditional `for` loop to iterate over the array and find the desired element.

**Pros and Cons:**

1. **`Array.prototype.find()`**:
	* Pros: Shorter code, more concise, and easier to read.
	* Cons: May not be as efficient as other approaches for very large arrays, as it returns the first matching element and then iterates over the rest of the array.
2. **`Array.prototype.findIndex()`**:
	* Pros: Returns the index of the first matching element, which can be useful for further processing or manipulation.
	* Cons: May not be as performant as `find()` for very large arrays, but it's still relatively efficient.
3. **Classic for loop**:
	* Pros: Can be more control-oriented and flexible, especially when dealing with complex logic or edge cases.
	* Cons: More verbose code, can be harder to read and maintain.

**Library/Functionality used:**

None of the provided benchmark tests use any external libraries or functions. The `Array.prototype.find()` and `Array.prototype.findIndex()` methods are built-in JavaScript features.

**Special JS feature/syntax:**

There is no special JavaScript feature or syntax used in these benchmark tests. However, it's worth noting that some older browsers may not support modern JavaScript features like `find()` and `findIndex()`, which could affect the results of such a benchmark.

**Other alternatives:**

If you're looking for alternative approaches to find an element in an array, you might consider using:

1. **`some()`**: This method returns a boolean indicating whether at least one element in the array satisfies the provided testing function.
2. **`every()`**: This method returns a boolean indicating whether all elements in the array satisfy the provided testing function.
3. **Regular expressions** (e.g., `Array.prototype.some()` with a regex): If you're dealing with an array of strings or numbers, regular expressions can be a powerful tool for finding specific values.

Keep in mind that these alternatives may have different performance characteristics and use cases compared to the original methods tested in this benchmark.

Related benchmarks:

find vs findIndex (Array prototype methods) 2 (version: 0)

Measuring which is faster

Comparing performance of: Array.prototype.find vs Array.prototype.findIndex vs classic for loop

Created: 4 years ago by: Guest

Jump to the latest result

Array.prototype.find

Array.prototype.findIndex

classic for loop

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):