Benchmark: Js Search -String IndexOf vs Includes

Tests:

Index Of
var a = 'hello#a#bc#helloa'; var b = a.indexOf('helloa');
Includes
var a = 'hello#a#bc#helloa'; var b = a.includes('helloa');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Index Of
Includes

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one month ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 Edg/131.0.0.0

Browser/OS: Chrome 131 on Windows

View result in a separate tab

Test name	Executions per second
Index Of	162923632.0 Ops/sec
Includes	155269088.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested.

**Benchmark Purpose**

The main goal of this benchmark is to compare the performance of two string searching methods in JavaScript: `indexOf` and `includes`. These methods are used to find the index of a specific substring within a larger string.

**Options Compared**

Two options are compared:

1. **String.indexOf()**: This method searches for the first occurrence of a specified value in a string. It returns the index of the found value, or -1 if no match is found.
2. **String.includes()**: This method checks if a string includes a specified value (or substring) as one of its characters. It returns `true` if the value is found, and `false` otherwise.

**Pros and Cons**

*   `indexOf()`:
    *   Pros:
        +   Faster for searching specific substrings.
        +   More flexible, allowing for searching from any position in the string.
    *   Cons:
        +   May return -1 if no match is found, which can be considered as an error.
        +   Less intuitive for some developers due to its more complex behavior.
*   `includes()`:
    +   Pros:
        +   Simpler and more intuitive than `indexOf()`.
        +   More suitable for cases where you're checking if a string includes any of several values.

**Other Considerations**

The choice between these two methods depends on the specific use case. If you need to find a specific substring within a large string, `indexOf()` might be faster. However, if you're searching for multiple values and want a simple, intuitive way to do so, `includes()` is likely a better choice.

**Library Used**

None are explicitly mentioned in this benchmark.

**Special JS Feature or Syntax**

No special JavaScript features or syntaxes are used in these test cases.

**Alternative Approaches**

Other approaches to implement string searching include:

*   Using regular expressions (regex) with the `RegExp` object.
*   Implementing a custom search algorithm using bit manipulation or other techniques.
*   Utilizing third-party libraries like Lodash or String.prototype.search()

Related benchmarks:

Js Search -String IndexOf vs Includes (version: 0)

Comparing performance of: Index Of vs Includes

Created: 2 years ago by: Guest

Jump to the latest result

Index Of

Includes

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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