Benchmark: js find vs indexOf with item get

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().indexof()
const item = arr[arr.indexOf(1E5)];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype().find()
Array.prototype().indexof()

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Measuring JavaScript performance is an essential task, especially when comparing different approaches to achieve the same result.

**Benchmark Overview**

The provided benchmark compares two methods for finding or retrieving a specific item in an array: `find()` and `indexOf()`. The test cases use a predefined array generated by the "Script Preparation Code" to populate the array with values from 0 to 100,000.

**Options Compared**

1. **Array.prototype.find()**: This method returns the first element in the array that satisfies the provided condition (in this case, `item === 1E5`). If no elements match, it returns `undefined`.
2. **Array.prototype.indexOf()**: This method returns the index of the first occurrence of the specified value (`1E5`) in the array. If the value is not found, it returns `-1`.

**Pros and Cons**

* **find()**:
	+ Pros: More readable code, as it explicitly states what we're looking for.
	+ Cons: May be slower due to the need to iterate through the entire array until a match is found.
* **indexOf()**:
	+ Pros: Can be faster since it returns the index directly, avoiding unnecessary iterations.
	+ Cons: Returns an index value, which might not be as clear or intuitive for some developers.

**Library and Purpose**

There are no external libraries used in this benchmark. Both `find()` and `indexOf()` are built-in methods of the Array prototype in JavaScript.

**Special JS Feature/Syntax**

This benchmark doesn't use any special JavaScript features or syntax beyond the standard array methods and arithmetic operations (e.g., exponentiation).

**Other Alternatives**

If you need to find a specific item in an array, consider the following alternatives:

1. **Array.prototype.includes()**: Similar to `find()`, but returns `true` if the element is found anywhere in the array.
2. **Binary search**: If your array is sorted or can be easily sorted, using binary search can be more efficient than linear search (e.g., `indexOf()`).
3. **Data structures other than arrays**, such as linked lists, trees, or graphs, which might offer better performance characteristics for specific use cases.

**Benchmark Result Interpretation**

The provided benchmark results show the execution times for each test case on a Chrome 94 browser with a desktop platform and Mac OS X 10.15.7 operating system. The first result shows `indexOf()` being faster, while the second result shows `find()` being slightly slower. However, these results may vary depending on your specific use case, array size, and hardware configuration.

In conclusion, when comparing `find()` and `indexOf()`, consider the trade-off between readability and performance. If you need a more straightforward solution with better performance, using `indexOf()` might be suitable. For cases where code readability is crucial or the array doesn't require frequent updates, `find()` could be a better choice.

Related benchmarks:

js find vs indexOf with item get (version: 0)

Comparing performance of: Array.prototype().find() vs Array.prototype().indexof()

Created: 4 years ago by: Guest

Jump to the latest result

Array.prototype().find()

Array.prototype().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):