Benchmark: IndexOf vs Includes in stringa

Script Preparation code:

var string = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.'

Tests:

IndexOf
string.indexOf('tempor')
Includes
string.includes('tempor')
replaceall
string.replaceAll("emp","sau");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
IndexOf
Includes
replaceall

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/118.0

Browser/OS: Firefox 118 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
IndexOf	737733312.0 Ops/sec
Includes	25135230.0 Ops/sec
replaceall	2557358.8 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to explain the benchmark and its options.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark that compares the performance of three different string manipulation operations: `indexOf`, `includes`, and `replaceAll`. The benchmark uses a predefined string, "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.", to test these operations.

**Options Compared**

The three options compared are:

1. `string.indexOf('tempor')`
2. `string.includes('tempor')`
3. `string.replaceAll("emp", "sau")`

These operations differ in how they search for and replace characters in the string.

**Pros and Cons of Each Approach**

* **`indexOf`**: This operation searches for a specific character or substring within the string and returns its index. The pros are that it's relatively fast and efficient, as it only needs to scan through a small portion of the string. However, the cons are that it can return -1 if the character is not found, which may require additional checks in some cases.
* **`includes`**: This operation searches for a specific value within the string and returns a boolean result indicating whether the value was found. The pros are that it's often faster than `indexOf`, as it doesn't need to return an index. However, the cons are that it can be slower for very large strings or when searching for substrings.
* **`replaceAll`**: This operation replaces all occurrences of a specified character or substring within the string with another value. The pros are that it's often faster than `indexOf` and `includes`, as it only needs to scan through the entire string once. However, the cons are that it can be slower for very large strings or when replacing substrings.

**Other Considerations**

* **String Construction**: When creating a new string using one of these operations, it's essential to consider the overhead of creating a new object and its associated memory allocation.
* **Substring Matching**: In the case of `indexOf` and `includes`, substring matching is an important consideration. The benchmark may not account for cases where the search value is not exactly matched due to string normalization or other factors.

**Library Used**

None of the provided operations use a library, as they are built-in JavaScript functions.

**Special JS Features or Syntax**

The provided benchmark does not explicitly use any special JavaScript features or syntax. However, it's essential to note that some modern browsers may have optimizations for certain string operations, such as `String.prototype.includes()`.

**Alternatives**

If you wanted to create a similar benchmark but with different options, here are some alternatives:

* Instead of `indexOf`, consider using `lastIndexOf` or `indexOfRegex` (if available) to test the performance of finding indices in strings.
* Consider adding more string manipulation operations, such as `split()`, `concat()`, or `every()` and `some()`.
* You could also create a benchmark that compares the performance of different string encoding schemes or character sets.

Please keep in mind that creating a high-quality benchmark requires careful consideration of various factors, including the specific use case, hardware, software, and platform.

Related benchmarks:

IndexOf vs Includes in stringa (version: 0)

Banana

Comparing performance of: IndexOf vs Includes vs replaceall

Created: one year ago by: Guest

Jump to the latest result

IndexOf

Includes

replaceall

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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