Benchmark: IndexOf vs Manual Search test 2

HTML Preparation code:

IndexOf

Script Preparation code:

var container = 'This is a long sample string'
var substring = 'This is a long sample string';

Tests:

Manual Search
for (var containerIndex = 0; containerIndex < container.length; ++containerIndex) { var containerChar = container[containerIndex]; for (var substringIndex = 0; substringIndex < substring.length; ++substringIndex) { } }
Inverted Search
for (var substringIndex = 0; substringIndex < substring.length; ++substringIndex) { for (var substringLength = substring.length; substringLength > 0; --substringLength) { var match = container.indexOf(substring.substring(substringIndex, substringLength)); } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Manual Search
Inverted Search

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided JSON represents a JavaScript benchmarking test case on the MeasureThat.net website. The test compares the performance of two approaches for finding a substring in a larger string: manual search and inverted search using `indexOf()`.

**Approaches Compared**

1. **Manual Search**: This approach involves iterating over the characters in the target substring and manually checking each character against the corresponding characters in the larger string.
2. **Inverted Search (Using `indexOf()`)**: This approach uses the built-in `indexOf()` method to search for the target substring within the larger string.

**Pros and Cons**

* **Manual Search**:
	+ Pros:
		- Can be more intuitive and easier to understand, as it involves a simple linear scan.
	+ Cons:
		- Typically slower than inverted search due to its brute-force nature.
		- May not handle edge cases (e.g., empty strings or null inputs) well.
* **Inverted Search (Using `indexOf()`)**:
	+ Pros:
		- Generally faster than manual search, especially for larger substrings.
		- Handles edge cases more robustly.
	+ Cons:
		- May not be as intuitive, as it relies on the implementation details of `indexOf()`.
		- Can be less effective in certain scenarios, such as when the substring is very short or the string is extremely large.

**Library Used**

None explicitly mentioned. However, the use of `indexOf()` implies that the JavaScript engine being tested supports this method.

**Special JS Feature/Syntax**

* The test uses a feature called "regular expressions" (regex) implicitly through the use of `substring` and `indexOf()`. While not explicitly used in the provided code, regex is often used for string matching and manipulation.
* The test also employs a feature called " scope binding" due to the use of `var` declarations within the loops.

**Other Alternatives**

1. **Regular Expression-based Search**: Instead of using manual search or inverted search, you could use regular expressions (regex) to find the substring. This approach would provide more flexibility and might be faster for certain types of substrings.
2. **Slicing and Looping**: Another alternative approach would involve slicing the larger string to create a smaller substring and then looping through each character in the original string to compare with the target substring.

**Benchmark Preparation Code**

The provided script preparation code sets up a test scenario by defining two variables: `container` and `substring`. The `container` variable contains a long sample string, while the `substring` variable also contains a similar string. This setup allows for testing both manual search and inverted search approaches within the same benchmark.

**Individual Test Cases**

The provided individual test cases are:

1. **Manual Search**: A loop iterates over each character in the target substring and manually checks if it matches any character in the larger string.
2. **Inverted Search**: A loop uses `indexOf()` to search for the target substring within the larger string, iterating over decreasing lengths of substrings to cover all possible positions.

**Latest Benchmark Result**

The provided benchmark result shows the execution times for both manual search and inverted search approaches on a specific device platform (Desktop, Linux) using Firefox 105. The results indicate that the inverted search approach is generally faster than the manual search approach.

Related benchmarks:

IndexOf vs Manual Search test 2 (version: 0)

Comparing performance of: Manual Search vs Inverted Search

Created: 3 years ago by: Guest

Jump to the latest result

Manual Search

Inverted Search

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):