Benchmark: array indexOf vs includes vs some v3

Script Preparation code:

var array = 'test_'.repeat(49999).split('_');
array.push('findMe');

Tests:

indexOf
array.indexOf('findMe') !== 1
includes
array.includes('findMe')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
indexOf
includes

Fastest: N/A

Slowest: N/A

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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 its test cases to understand what's being tested.

**Benchmark Purpose:**
The purpose of this benchmark is to compare the performance of three different methods for checking if an array contains a specific value:

1. `array.indexOf()`
2. `array.includes()`
3. `array.some()` (with version 3, likely referring to the `some()` method introduced in ECMAScript 2019)

**Options Compared:**

* **`indexOf()`**: Returns the index of the first occurrence of the specified value, or -1 if not found.
	+ Pros:
		- Efficient for exact matches (i.e., finding the first occurrence of a specific value).
		- Can be used to get the index of the matched element.
	+ Cons:
		- May return incorrect results if the array is modified between searches.
		- Not suitable for approximate matching or fuzzy matching.
* **`includes()`**: Returns true if the specified value is present in the array, and false otherwise.
	+ Pros:
		- Efficient and easy to use.
		- Does not modify the original array.
		- Suitable for exact matches (i.e., finding presence of a specific value).
	+ Cons:
		- May be slower than `indexOf()` for large arrays or exact matches.
* **`some()`**: Returns true if at least one element in the array satisfies the provided callback function.
	+ Pros:
		- Efficient and flexible, allowing for more complex matching logic.
		- Suitable for fuzzy matching or finding any occurrence of a value.
	+ Cons:
		- May be slower than `indexOf()` or `includes()` for exact matches.
		- Requires additional logic to extract the matched value.

**Library and Special Features:**
None mentioned, but it's worth noting that this benchmark assumes JavaScript environments that support these methods.

Now, let's discuss other alternatives for similar use cases:

1. **Using `Array.prototype.includes()` equivalent**: If you're using an older JavaScript version that doesn't have the `includes()` method, you can create a custom implementation using `indexOf()` and a simple logic to check for presence.
2. **Regular expressions (regex)**: For fuzzy matching or more complex patterns, regex might be a viable alternative. However, it's generally slower than the methods tested in this benchmark.

**Considerations:**
When choosing between these methods, consider the following factors:

* Exact matches vs. approximate matching
* Performance requirements for large arrays or high-speed searches
* Need for index information or other array properties
* Desire for flexibility and custom logic in the matching process

This benchmark provides a helpful comparison of three common methods for checking array presence, allowing users to evaluate their performance and choose the best approach for specific use cases.

Related benchmarks:

array indexOf vs includes vs some v3 (version: 0)

performance comparison of ways to find if an array contains a value

Comparing performance of: indexOf vs includes

Created: 3 years ago by: Guest

Jump to the latest result

indexOf

includes

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):