Benchmark: indexOf vs startsWith vs includes

Tests:

startsWith
const url = "https://example.com/path/to/index.html" url.startsWith("https://example.com")
indexOf
const url = "https://example.com/path/to/index.html" url.indexOf("https://example.com") > -1
includes
const url = "https://example.com/path/to/index.html" url.includes("https://example.com")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
startsWith
indexOf
includes

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36 Edg/123.0.0.0

Browser/OS: Chrome 123 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
startsWith	37290164.0 Ops/sec
indexOf	137541904.0 Ops/sec
includes	133043168.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided JSON represents a benchmark test that compares the performance of three string methods in JavaScript: `indexOf`, `startsWith`, and `includes`. The test creates a sample URL string, then uses each method to check if the URL starts with or contains a specific substring (`"https://example.com"`).

**Options Compared**

The benchmark tests the following options:

1. **`indexOf()`**: This method searches for the specified substring in the original string and returns its index.
2. **`startsWith()`**: This method checks if the original string starts with the specified substring.
3. **`includes()`**: This method checks if the original string includes the specified substring.

**Pros and Cons of Each Approach**

1. **`indexOf()`**:
	* Pros: Efficient for searching a specific substring, as it uses a linear search algorithm.
	* Cons: May be slower than other methods for large strings or when searching for substrings that are not present in the string.
2. **`startsWith()`**:
	* Pros: Faster than `indexOf()` for small strings, as it only needs to check the first few characters.
	* Cons: May be slower than `includes()` for larger strings, as it still performs a search operation.
3. **`includes()`**:
	* Pros: More efficient than `indexOf()` or `startsWith()` when searching for substrings in large strings, as it uses a more optimized algorithm.
	* Cons: May be slower than `startsWith()` for small strings, as it needs to perform a full search.

**Library Usage**

There is no explicit library usage mentioned in the benchmark. However, some JavaScript engines may provide additional methods or optimizations for these string operations. For example, Chrome's V8 engine has implemented various optimizations for string operations, including `startsWith()` and `includes()`.

**Special JS Features/Syntax**

None of the test cases explicitly use any special JavaScript features or syntax, such as async/await, Promises, or modern ES modules. The benchmark focuses on comparing the performance of basic string methods.

**Other Alternatives**

If you wanted to modify this benchmark, here are some alternative options:

* Test other string methods, such as `endsWith()`, `replace()`, or `split()`.
* Use different input strings or substrings to see how the performance compares.
* Modify the test code to include additional logic or operations that affect performance, such as regular expressions or string concatenation.
* Compare the performance of these methods on different types of data, such as numbers, arrays, or objects.

Related benchmarks:

indexOf vs startsWith vs includes (version: 0)

Comparing the string methods: indexOf, startsWith, includes

Comparing performance of: startsWith vs indexOf vs includes

Created: 2 years ago by: Guest

Jump to the latest result

startsWith

indexOf

includes

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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