Benchmark: startsWith vs includes when no match

Tests:

"Hello, I am a bit of text" does not start with "Something"
"Hello, I am a bit of text".startsWith("Something")
"Hello, I am a bit of text" does not include "Something"
"Hello, I am a bit of text".includes("Something")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
"Hello, I am a bit of text" does not start with "Something"
"Hello, I am a bit of text" does not include "Something"

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark definition is provided in JSON format and consists of two parts:

1. `Script Preparation Code`: This section is empty, which means that the script for running the benchmark has already been prepared by someone else or is not required for this particular test.
2. `Html Preparation Code`: This section is also empty, indicating that the HTML code for running the benchmark is not needed or is not provided.

**Individual Test Cases**

There are two individual test cases:

1. **startsWith vs includes when no match**
	* The first benchmark definition string `"Hello, I am a bit of text".startsWith("Something")` checks if the string `"Hello, I am a bit of text"` starts with the substring `"Something"`.
	* The second benchmark definition string `"Hello, I am a bit of text".includes("Something")` checks if the string `"Hello, I am a bit of text"` includes the substring `"Something"`.
2. **Test Names**
	* `\"Hello, I am a bit of text\" does not start with \"Something\"`
	* `\"Hello, I am a bit of text\" does not include \"Something\"`

**Comparison**

The two test cases are comparing the performance of `startsWith` and `includes` methods when there is no match. The purpose of this comparison is to determine which method is faster for this specific use case.

**Options Compared**

The options being compared in these test cases are:

* `startsWith`: Returns `true` if the string starts with the specified substring, or `false` otherwise.
* `includes`: Returns `true` if the string includes the specified substring, or `false` otherwise.

**Pros and Cons of Each Approach**

1. **startsWith**
	* Pros:
		+ Typically faster for non-overlapping strings (since it only needs to check a single character at a time).
		+ More concise in code.
	* Cons:
		+ May not be as flexible as `includes` since it requires the substring to start with the search term.
2. **Includes**
	* Pros:
		+ More flexible than `startsWith`, as it allows for partial matches anywhere in the string.
		+ Can handle overlapping strings.
	* Cons:
		+ May be slower than `startsWith` for non-overlapping strings due to the need to check multiple characters.

**Other Considerations**

When deciding between `startsWith` and `includes`, consider the following factors:

* String length: For short strings, `startsWith` might be faster. For longer strings, `includes` might be more suitable.
* Substring position: If the substring appears in a predictable location within the string (e.g., always at the beginning), `startsWith` might be a better choice.

**Library Used**

In these test cases, no specific library is mentioned or required. The comparison is purely between two built-in JavaScript methods, `startsWith` and `includes`.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax used in these test cases beyond the use of string manipulation functions like `startsWith` and `includes`.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser/OS: Chrome 129 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
"Hello, I am a bit of text" does not start with "Something"	168812864.0 Ops/sec
"Hello, I am a bit of text" does not include "Something"	221721136.0 Ops/sec

Related benchmarks:

startsWith vs includes when no match (version: 0)

Comparing performance of: "Hello, I am a bit of text" does not start with "Something" vs "Hello, I am a bit of text" does not include "Something"

Created: 7 months ago by: Registered User

Jump to the latest result

"Hello, I am a bit of text" does not start with "Something"

"Hello, I am a bit of text" does not include "Something"

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):