Benchmark: Substring in a string: IndexOf vs Includes vs lodash includes

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var text = "1KX5 P/CKD TORTELLINI BRAIS BEEF CA CT 631 ***** note: we don't sell this. *****";

Tests:

IndexOf
text.indexOf('note') !== 1
Includes
text.includes('note')
lodash
_.includes(text, 'note')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
IndexOf
Includes
lodash

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 6 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:131.0) Gecko/20100101 Firefox/131.0

Browser/OS: Firefox 131 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
IndexOf	1562450816.0 Ops/sec
Includes	1558164736.0 Ops/sec
lodash	35513388.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

Measuring that net is an excellent resource for comparing the performance of different JavaScript methods.

**Benchmark Definition**

The provided JSON represents a benchmark test for finding a substring in a string using three different methods: `indexOf`, `includes`, and a custom implementation with Lodash's `includes` function. The test checks which method is faster, providing insights into the performance characteristics of each approach.

**Options Compared**

1. **`indexOf`**: This method searches for the specified value in the string and returns the index of the first occurrence. If the value is not found, it returns -1.
2. **`includes`**: This method checks if a string includes another string as a substring. It's similar to `indexOf`, but it doesn't return an index; instead, it returns `true` or `false`.
3. **`lodash.includes`**: This function is part of the Lodash library and performs the same check as `includes`. However, its implementation might be optimized for performance.

**Pros and Cons**

*   **`indexOf`**: Pros: Simple to implement, widely supported. Cons: Returns an index (if found) or -1 if not found, which can lead to unnecessary calculations.
*   **`includes`**: Pros: Similar to `indexOf`, but returns a boolean value, making it more concise. Cons: Also returns `true` or `false`, similar to `indexOf`.
*   **`lodash.includes`**: Pros: Optimized for performance, provides a simple and concise API. Cons: Requires the Lodash library, which might add overhead.

**Library Usage**

In this benchmark, the Lodash library is used for its `includes` function. This suggests that the author wants to compare the performance of the built-in JavaScript methods with a popular utility function from another library.

**Special JS Feature/Syntax**

There doesn't appear to be any special JavaScript features or syntax mentioned in the provided code snippets. The focus is on comparing different string search methods.

**Other Alternatives**

If you're interested in exploring alternative approaches, here are some other options:

*   **`String.prototype.includes()`**: Similar to `includes`, but part of the standard JavaScript API.
*   **`Array.prototype.indexOf()`**: If you want to find an index within a larger array or string.
*   **Regular Expressions**: Can be used for more complex searches, such as pattern matching.

For further information on measuring performance in JavaScript, consider checking out [Measuring that net](https://www.measuringthat.net/) and other resources.

Related benchmarks:

Substring in a string: IndexOf vs Includes vs lodash includes (version: 0)

Testing for the speed of finding a substring in a string.

Comparing performance of: IndexOf vs Includes vs lodash

Created: 4 years ago by: Guest

Jump to the latest result

IndexOf

Includes

lodash

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):