Benchmark: String includes vs indexOf

Script Preparation code:

var str = "field.key.position[0]";

Tests:

Includes
str.includes(".") || str.includes("[")
IndexOf
str.indexOf(".") != -1 || str.indexOf("[") != -1

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Includes
IndexOf

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks and explore what's being tested in this specific benchmark.

**Overview**

The provided JSON represents a benchmark that compares two approaches: `includes` and `indexOf`. The test is designed to measure which method is faster for checking if a certain character or substring exists within a given string.

**Options Compared**

Two options are compared:

1. **`str.includes(".\") || str.includes("[\")`**: This approach uses the `includes()` method, which returns `true` if the specified value exists in the string and `false` otherwise.
2. **`str.indexOf(".\") != -1 || str.indexOf("[\\") != -1`**: This approach uses the `indexOf()` method, which returns the index of the first occurrence of the specified value in the string, or `-1` if it's not found.

**Pros and Cons**

Here are some pros and cons for each approach:

**Includes:**

Pros:

* Easier to read and understand, as it's a more straightforward method.
* Can be implemented using a simple loop, which can be faster.

Cons:

* May have performance issues due to the need to iterate through the entire string.
* Might not be optimized by modern browsers or engines.

**IndexOf:**

Pros:

* Generally faster, as it uses an index-based approach that's more efficient than iterating through the entire string.
* Often optimized by modern browsers and engines for better performance.

Cons:

* May require more complex implementation, especially if you need to handle edge cases like `indexOf(-1)` returning `-1`.
* Can be less readable due to its use of indexing.

**Other Considerations**

When choosing between these two approaches, consider the following factors:

* Readability and maintainability: If readability is important, the `includes()` approach might be a better choice.
* Performance: If performance is critical, the `indexOf()` approach might be faster, but it requires more expertise to implement correctly.

**Library Usage**

There's no explicit library usage in this benchmark. However, note that some modern browsers and engines may have internal optimizations or polyfills for these methods, which could affect the results of your benchmark.

**Special JS Features or Syntax**

This benchmark doesn't explicitly use any special JavaScript features or syntax beyond the standard `includes()` and `indexOf()` methods. However, it's worth noting that modern browsers and engines often provide optimized implementations for these methods, which might impact the benchmark results.

**Alternative Approaches**

Other approaches you could consider using in a similar benchmark include:

* Regular expressions (e.g., `/.\|[\]/g`): These can be more efficient than `includes()` or `indexOf()`, but require expertise to implement correctly.
* Loop-based approaches: Implementing a loop to check for the presence of a character or substring can be faster, but may not be optimized by modern browsers or engines.

Overall, this benchmark provides a good starting point for exploring the performance differences between `includes()` and `indexOf()` in JavaScript. By understanding the pros and cons of each approach, you can make informed decisions about which method to use in your own projects.

Related benchmarks:

String includes vs indexOf (version: 0)

Comparing performance of: Includes vs IndexOf

Created: 4 years ago by: Guest

Jump to the latest result

Includes

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):